you said you won a $25 prize? was it a gift certificate?
if so- you received it with the email that said you won it-
with your notification is the name of the shop the gc is for- and the gift certificate #- you visit the shop- choose what you want to purchase- during check out put in the gc #- i also in their (comments/special instructions) area write that i won the gc and thank them for it- just to make sure they realize it is there---and of course-to thank them.