How and where to enter HP dv800t Coupon code

I am trying to configure HP dv800t using the coupon code given, but could not find the location where i should enter the code.

you need to add it to cart, check out, create an account or sign in, at the payment page there is a field for coupon code.

thats kinda risky..
i got the field to enter coupon code... actually u have to fill in ur credit card info b4 submitting...
does it gives any warning if the code doesnt work???

or does it just proceed n makes the payment?

after entering the coupon code you will have a chance to review the amount before the order is submitted

Dear moderator..
thanx a lot for your support!