How to capture t-shirt sizes using a GivePanel data capture form

How do I add a field to the form to capture t-shirt size?

1. Head on over to your Account Settings and then to the form tab
2. When you're in the form, under ''What fields would you like to display in the form?'' you will see a tick box called ''dropdown''
3. By selecting this, you will then see the option to capture multiple-choice and here you can add in various T-shirt sizes.