Hello, im kinda new to this game (actually downloaded it today) so, i need help to log in in the server.

I read lot of answers like mine and all of them said that is needed to log in with username, i did it but it didnt work cause it said somehow i had no internet conection, i checked my net twice but the client still not respond and as im writing this it's happening at the same time. (i didnt installed the T.W.O.T.L.K (old) but the other).