I'm trying to add a required check box and email address to this form. Paypal Payment Buttons

[irsmith]

I'm trying to add a required check box and email address to this form below and save the that info (checkbox and email address) to a cvs file on my server

The form was created using Paypal Payment Buttons
form:   http://thegallery.us/temp/pp.html

Thanks for your help.