how do you apply the code?

[KorieDWnut]

Once you have a code what do you do with it? Do I have to call and say I have a code? Or do you enter it somewhere when you book online? I always book online right through the WDW site but I don't see anywhere to enter a code.

Thanks!

EDITING: Sorry all! I just found numerous threads on the same exact thing I posted. I will just look there Sorry for not checking around first!!