(SOZ IM LATE I WAS FIRIN MY LAZAR AT A KOOKIE!)
Blockhead10015 / Blockhead16752 Right here.
(NINJAEDIT)
Anyway, this happened to me a while ago. See that login name thingy at the bottom? Put your username in it and a password. Then, click the button that says "Disconnect", wait for it to finish, then click connect. Then, it should work. If it doesnt, re-download RTB, and try again.