Did you file a bug? That doesn't happen. Normally you log in. And that's it. On a new device, you can (optionally) verify your account to see previous encrypted comversations. But you don't have to do that.

As for the chat rooms, they work exactly like Discord, which is exactly like every chat client with chat rooms has since the dawn of IRC. You can send a message to one person, or you can join a room and message everyone at the same time.

Easy peasy!