Hi,
You may find you need another server, it sounds as if you currently only have a home server configured. This is NOT a one server and you're done setup I'm afraid.
With regard to your level, that's configured in the game.ini these lines here :-
PlayerDefaultNoDiscoveriesMaxLevelUps=### <- Configures what level you can get to without any discoveries
bClampHomeServerXP=True/False <- Configures if the home server is level capped (yours is)
ClampHomeServerXPLevel=8 <- configures what the cap is set to on your home server.
Game.ini is located in Atlasmain/shootergame/saved/server/config/WindowsServer if you have access to a file browser.
G-Portal should have told you all this, or at the very least hidden the information in a wiki / faq somewhere.
Hope that helps
Edit: P.S. Merry Christmas