How do I uses gift cards

I believe the sellers server kiosks taker gift cards as well

You can use the gift card number like a credit card/they have a field for that

If you order your tickets online there is an option to add gift cards or you just hand them to the cashier at the theater

You use them like a credit card if you are buying online.

If you order your tickets online, there is a text field when you pay. If you're getting the tickets at the theater, I think you just hand them the gift card