What you can do is change the following things that you might find in your pro-form's shortcode:
Step #1. Ask PayPal® to activate Express Checkout for you. (free)
Express Checkout will give you API Credentials, and you'll enter these into:
s2Member -> PayPal Options -> PayPal® Account Details.
Step #2. In the Shortcodes provided by s2Member Pro... change this:
accept_via_paypal="paypal" to this instead:
accept_via_paypal="paypal,visa,mastercard,amex,discover,maestro,solo".
Or you can do this:
Log into your PayPal® account, and navigate to
Profile -> API Access (or Request API Credentials). You'll choose
(Request API Signature). Now... here is the tricky part; whenever you generate a Pro Form Shortcode with s2Member, be sure to change
accept="paypal,visa,mastercard,amex,discover,maestro,solo" to just
accept="paypal"; thereby excluding the on-site credit card processing functionality; which is available only with PayPal® Pro.
I'm not sure which one will remove them but it won't hurt to do both.
As I understand it the
accept="" attribute controls which button icons are visible, and the
accept_via_paypal="" controls which payment methods will ultimately lead to the user to PayPal.
Hope this helps.