Go into your User CP, then on the left Edit Your Details. Should be just above your date of birth. But I don't remember if that is a supporting member option only.
2012 Sport S 2D, Silver, Hardtop, Manual, Tow, 3.73, Infinity, Air Bags, Power Convenience
Heated Seats, Side Steps, Hood Lock, Gas Cap Lock, Fuel Door
Ordered 6/27/11, D1 6/29/11, Built 7/22/11, Delivered 8/19/11.
Hummer Kills: 6