1. Copy the .minecraft folder into "C:\Users\your user\AppData\Roaming"
2. Launch MinecraftSP.exe "if you get an error (could not find main class) just close it, wait 5sec and then Launch it again. (This is a very common error)
3. Click Multiplayer, then select "TeamExtremeMC.com" and hit connect.
4. If you don’t want to play multiplayer, then play single player mode.
I have a mod on my server that protects whatever username you pic when you first launch minecraft, when you logon you will be unable to move untill you type /register (password here) then next time you connect just type /login (password here) e.g
/register bunnies and /login bunnies simple and easy.
Forums info: Forums.TeamExtremeMC.com