OK, I feel like a complete idiot now, cause I can't find no box to click or space to enter text anywhere on any page, could anybody please specify where on what page you have to enter your discount code?????
When checking out, after choosing the size and color, continue to "account info", then to "shipping & payment", below payment method, there is a "Coupon/Gift Certificate" tab, enter "vehicross" there for the discount. Good luck!