Some of the more experienced folks here at DOD may be able to tell you how to stick out your left leg while rubbing your tummy and holding your nose while you enter the codes to get them to work

.
I've found in the past if you can't get them to work, call CS and they'll usually put it through for you with whatever codes you have, as long as they're not expired or specifically exclude using in conjunction. I once got a leather briefcase and a whole load of supplies for $3 and change SHIPPED, but I had to call CS to do it.
1-800-3STAPLE (378-2753)
Good luck!
Crystal