When i join A Multiplayer server,i got a message saying not connected,in some servers it loads for a second,then it says in the chat cannot connect to Player Warrior474.And my internet is Good.I haven't played for a ling time please help!

take a look at the room name e.g: public6

open tb then do /jo public6
It wont load but do that command again
see if it works
sorry if it doesn't

Thecnical issues belong to the support board. Moving the thread for you.

It gives a reason why you can't connect in chat, can you please supply a screenshot or at least tell us what error it gives you when you try join a room?