On the top right corner, click on your name. Then click on "Account".

It will send you to your purchase history. There, click on the "Gifts" tab. It will show you the amount of the gift certificate.

When you use the gift certificate for your purchase it will use the entire thing to pay for your order. You can't just use a portion of a gift certificate, unless your order is less than the amount of the gift certifate.

It will keep track of the amount spent, so if your gift certificate is a $20 certificate and your order was for $10.00 it will let you spend the remaining $10.00 at a later date :)

If your order is $25.00 it will subtract the $20.00 and require another source of payment for the remaining $5.00 :)

Antje