Default [Q] Why I cant change profile picture on XDA?

Bro I wanna ask, why I cant change my profile picture on XDA?
Thanks for your answer
SONY XPERIA SP C5302
ROM: Ultimate PureXSP (C5303)
Status: ROOTED
Bootloader: LOCKED
Android: 4.3
Build: 12.1.A.1.205
Kernel: Stock Kernel