Change the name of the Bill Me Later option during check out

Guests have two payment options when registering. Online credit card option isn't the question. To have a button that says Bill Me Later for a non profit charity event might be confusing to guests. We don't bill later. They pay another way, like mail a check or pay at the door. We track by seeing Pending in the payment field. Also, when you click on Bill Me Later, you get the check mail-in address. Why not make the button read PAY LATER or I'll Pay Later or PAY ANOTHER WAY? I didn't see where I could change the button label. I can see losing guests because the button label is confusing and they don't want to pay then or online