At 'Server Address' you enter:
At 'Nickname' you enter your WoT nickname,
followed by your name in brackets, and which tier tanks you have.
This should then look like this:
nickname (name) I-X

(Eg Tom with ingame Tankie, log in with: Tankie (Tom) VI-VIII)

Then click on 'Connect' and you enter the lobby of the DPG server.
(for the 1st time on teamspeak please read the rules)
Welcome and have fun!