When setting up your Change point of sale app, one of your first steps will be creating Departments and Items. A Department is a classifier which assigns a tax rate and an Item is anything that can be added to an order.
You can make any payment label (Credit Card, Check, Cash, Dwolla, Gift Card) disappear from your checkout. Just tap your logo (top left corner), "Settings," "Payment Options," (payment type), "OFF," and "Exit." And it's gone.