You can test out customizations on the sample board, but we don't have the manpower to offer customization help any longer. And most of the BbHelpers don't come to support anymore so that forum was closed since it was supposed to be members helping other members. I can't really help with that, but the attachments we can.
Did you want BbBoy to remove ALL of them because he could easily if you like QueenMamaBug. If you want only a certain few list the ones you want gone and I'll pass it on to him and he can remove them for you. Not sure why the system isn't recognizing your attempts to delete them but he can definitely remove them for you manually.