how to report?

I just started a game with someone named [name removed - MOD] and they instantly resigned. I have no problem with this, but their profile picture had a half nude woman showing breasts, and I feel uncomfortable showing my friends and family(younger ones), how can I remove it from the previous games screen and report them?

I've removed the inappropriate avatar.

To contact support for something like this in future, you can select Report Abuse under the Help menu.

where do you find the help menu?

If the menu is at the top:

If the help menu is at the side:

on my mobile version it does not show any of those except settings. I have 3 lines in top left corner starting with video, computers, drills, watch etc but no help menu. thanks.

Hmm... I'm not actually sure where it is on the mobile version.  But this post has some links: https://www.chess.com/forum/view/general/how-to-contact-support