Person coming into my games and defacing my home page

I'm not sure where to post or report this. Someone with the screen name of "Hilary" has come into my Monday night game (a paid game) twice now and has tried to deface this game. This is person has dragged shapes and other PNG files onto the page by the dozen. I saw them on their the first time (a few weeks ago). I caught them today, and tried to find their account on the game page, but they left the game before I could open a new window with their information. I'm not sure if this person has been doing this sort of thing in other games, and I don't know if anyone has had a problem like this before. I can easily erase what this person keeps doing of course, it's just aggravating that it's happened twice now.

Hey was this the person you saw?:&nbsp; <a href="https://app.roll20.net/users/6784870/hilary" rel="nofollow">https://app.roll20.net/users/6784870/hilary</a> &nbsp; I saw your post and then went to look at games and round this odd post:&nbsp;&nbsp;<a href="https://app.roll20.net/lfg/listing/364970/5e" rel="nofollow">https://app.roll20.net/lfg/listing/364970/5e</a>&nbsp;

That's the same icon that this person used when they came into my game, so I'd say yes.

Hope this helps you then.