Is there a way to search a list for an item, then remove it?

Hi there everyone. I am working on a math game where students can make their own custom game patterns. I am working on a way for students to be able to delete custom patterns down the road.

So far I have this..

Basically the name of the pattern is in the LoadGameNameTXT.text. I am trying to get the code to search for it in the CustomGameList listbox, and if found remove it from the listbox, but I am getting a type mismatch error on this line..

CustomGameList.RemoveItem srch_stringzg

Can anyone tell me what I did wrong? :)

Thanks!!