hi i created a team and i m an admin
so when ill change my nick on game will i loose my admin?
and haw to do that?

Depends on which access flag your admin has been set, in users.ini there are explanation of admin access

; "STEAM_0:0:123456" "" "abcdefghijklmnopqrstu" "ce" / it's based on steam id, you can change your name on whatever you want.
; "123.45.67.89" "" "abcdefghijklmnopqrstu" "de" / by ip as long as you have that ip you can be admin, can change name and etc.
; "My Name" "my_password" "abcdefghijklmnopqrstu" "a" / this is by name, changing the name will lose your admin privilegies.

THANKS