Your best bet is to go to SwiftChat, New Update aswell

Welp, might as well get Swift,
Mumu makes you pay to join Chatrooms, when you can join a chatroom completely Free on SwiftChat, so if you guys are all complaining about Mumu, then you might as well go to Swift, as they had a New interface update recently too

yalltoomuch about Mumu Chat - Live Chat Rooms, Online Dating Singles, v1.6.1