Where to put a link for trouble reporting?

I have a dialog box for trouble reporting, i.e. the user clicks a link and a dialog box pops up. The user will have to fill out a form and then click submit.

Where should I put a link like this? I want it to be hidden and at the same time easy to find. It should not be in a place that is too visible, but I want the user to find it when he is looking for it. Where does a user look for such a link?

It is a web application for desktop.

Thanks