Q:

PHP to mySQL Issue

Hello,
I'm trying to make this script work, without success.
I'w eliminated alot of errors but 1 problem is still there.

Warning: mysqli_query() expects at least 2 parameters, 1 given in
  /mydomain.com/httpd.www/exampleForm.php on line 81

I'm trying to create a simple PHP/HTML file so I can post to my mySQL table.
If someone finds better code, or changes outside the problem in this code please feel free to tell me :)
Thanks in advance for any help! And I'm sorry that I'm bad at English.. 
Solved:
First part of my issue is solved, thanks to Milan.
UPDATE:
Link To Site: https://olefm.no/exampleForm.php 
Now I'm getting this after testing your suggestions: Warning: mysqli_query(): Empty query in /customers/a/f/b/olefm.no/httpd.www/exampleForm.php on line 80      
 <?php

        // Be sure to set up an SQL Table. The table is called newTable here.
        // Fields required include formText, form, formDropDown, formRadio
        // You should also add an autogenerated unique id as a primary key
        // and a datestamp. See Tutorial #3 for more info

      $link = mysqli_connect("@","@","@","@");
      if (!$link) {
          die('Could not connect: ' . mysqli_error());
      }
      echo 'Connected successfully';
      #mysqli_close($link);

        if($_POST['formSubmit'] == "Submit")

        // This code forces the user to fill out required fields.
        // 1. Adapt this part of the form to make additional fields required.
        // Required fields are optional.
        // When adapting required fields, this part of the form needs one SQL designation updated.

          {

            $errorMessage = "";

            if(empty($_POST['formText']))
              {
                $errorMessage .= "<li>Please enter some text.</li>";
            }

        // This block of code defines the variables
        // 2. This is the first required area to update when you revise this form.
        // When you add any fields to your form, you will need to define that field here.
        // This part of the form requires two SQL designations updated (form and var).

              $varText = $_POST['formText'];

              //This is where the recipient of the e-mail is defined. Alter to your need.

              $to = 'dev@olefm.no';

              //This is where the subject of the e-mail is defined. Alter to your need.

            $subject = "New Data Submitted";

        // headers and subject
        // this code should not be changed.

        $headers  = "MIME-Version: 1.0rn";

        $headers .= "Content-type: text/html; charset=iso-8859-1rn";

           // The e-mail that gets sent out will include this text in the body of the e-mail.
         // You can use variables in this part.
         // 3. If you have used variables in the body of the email
         // you will need to update one field here.
         // Variables in the e-mail are optional changes

        $body = "Please see database for further details.

      ";
        $body .= "Text entered: ".$varText."
      " . " ";

        mail($to, $subject, $body);

            if(empty($errorMessage))

              {

        // This block of code inserts the data into the database using the variables we defined before.
        // 4. This is the second required area to update when you revise this form.
        // When you add any fields to your form, you will need to request that the data be inserted in this code.
        // This part of the form requires two SQL designations updated (form and var).

                $sql = "INSERT INTO lager (Varenavn) VALUES (".

                                PrepSQL($varText) . ", " .

                mysqli_query($link, $sql);

        // The user is directed to this page after completing the form.
        // This code assumes that the thankyou form is in the same folder as the example form.

                #header("Location: thankYou.html");

                exit();

            }

        }

          // function: PrepSQL()
        // Do not alter this code.
          // It adds stripslashes and mysql_real_escape_string PHP functions
          // This sanitizes the SQL query
          // and inserts single quotes around the string

          function PrepSQL($value)

          {

              // Stripslashes

              if(get_magic_quotes_gpc())

              {

                  $value = stripslashes($value);

              }

          }

      ?>

      <!-- Begin HTML form -->

      <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

      <html>

      <head>

        <title>EXAMPLE FORM - PHP SQL</title>

      <!-- define some style elements-->

      <style>

      label,a

      {

        font-family : Arial, Helvetica, sans-serif;

        font-size : 12px;

      }

      .examplerule {
        font-family: Verdana, Geneva, sans-serif;
        font-size: 10px;
        font-style: normal;
      }
      .examplestyle {
        font-family: Arial, Helvetica, sans-serif;
        font-size: 12px;
      }
      </style>

      </head>

      <body>

             <p>
        <?php

                if(!empty($errorMessage))

                {

                    echo("<p>There was an error with your form:</p>\n");

                    echo("<ul>" . $errorMessage . "</ul>\n");

                  }

              ?>

               <!-- 3. From here down is the form you see in Design View, and the page as it appears on the web. -->
               <!-- Adapt this form by changing it to match what you are collecting in parts 1,2 and 4 -->

      </p>
             <p><strong><span class="examplestyle">Example Form
               </span>
             </strong>
      </p>
              <form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">

      <p>

        <label for='formText'>Please enter some text. </label>
                    <br/>

        <input type="text" name="formText" maxlength="50" value="<?=$varText;?>" />

              </p>
        </p>
        </span>

                <p>

               <input type="submit" name="formSubmit" value="Submit" />

                </p>

      </form>

      </body>

      </html>

A:

You are using wrong syntax for mysqli_* functions.  
For the specific warning that you mentioned, replace your code with the following:    
mysqli_query($link, $sql); //$link is the connection you established with database. 
You can refer this to get more details: http://php.net/manual/en/function.mysqli-connect.php

