What a pitty there are no 'active' users/moderators here that answer stupid questions from newbies.

I finally found the answer after reading the white paper, i'll place it here for future newbies:
UserName & Password
When EA issues commands to CVS, it does not supply any username. When you set
up CVS, the step where you checkout a CVS module and create your local working
copy, should create a subdirectory in your working copy, named "CVS". This
subdirectory will contain a file named "Root" which contains your CVS userID and
connection method. EA reads this file "Root" and extracts from it, your CVS userID.
(If EA does not find the file "Root", it retrieves the Windows userID, but this is NOT
the correct ID unless you are using a local repository.) EA uses the userID it finds, to
determine whether or not it is you that has an EA package file checked out. You will
not be able to modify packages in EA, unless EA has retrieved your correct CVS
userID.