Trolls

There is a troll operating on both TrueNudists and TrueSwingers. He uses at least 7 different names. He is selbby, yybles, baremale, redude35,custardpie, goocannon, nashvillenudie and a few others. He is insulting and tries to disrupt the chat rooms. When caught out he is abusive and then flags the person who has challenged him. How do we contact the owners of these sites to have him permanently removed .I hope someone can help