When you connect to the game you will see a server page which should say
And so on
Look on the left tool bar in the game.
Simply click on clan and you are in
Make a room(hot demo and demo makes you DC(disconnect)
You can make a normal team or a clan team. You need a full room to start.
Normal team-a set of 5 playing against random people
Clan team-a team of clan members who go against other clan members
Hope this helped a lot