How to mark an answer as a solution?

[sandino]

I posted a question and got an answer. How can I mark it as a solution? I couldn’t find any buttons to click.

Is it so only in Help category? Or is it still not implemented?

How to mark as "accepted answer" a response in Help / Questions category?

I see in the current banner that an “accepted answer” functionality exists for the Help / Questions category. I want to mark an answer to a question I asked (Responsive Design Testing: best method?) as accepted, but I can’t see how/where to do it. Can anyone help?