Q:

Show up a question to the interesting tab

How to show up an old question in the interesting tab without using a bounty? Should I just wait until someone answer?

A:

There is no option to manually show a question in the interesting tab. If you want to draw attention to an old question, you should add a bounty on that question. However if you improve the question by editing it, it will be bumped in the active tab and it will get some attention. But don't just edit to bump the question.

