[Uridium Wars]How to leave from clan?

Hy,my fried is in an another clan,and he can't leave.
Can sy help me?

Go to clan members tab, find your account there and leave it by pressing special button for it :D

Kami,hahaha .

I need a normal answer,we play uw about 1 weeks,and he cant leave the clan because he doesn't have button what specifized to leave.

Can anybody help me?
#UP!

Kami is giving the right answer..