How do あなた レポート someone?

That's a good question, how do あなた do anything on mobile?

No seriously, I'm still trying to figure out how to read コメント on my 画像 when I'm on mobile...

I'm on mobile and it's one of the options located underneath the user's プロフィール picture gallery. If it's not there then I have no idea.

There should be a button on the persons profile