Adding HTML for a Paypal Logo to MarketPress Lite

Since I’ve been told there is no way to change the “buy now” buttons in my store from the basic MarketPress Lite white to an official Paypal button, I was hoping to add a Paypal logo with the credit cards somewhere so buyers will know they’ll have options once they get to the checkout. I’ve found the HTML for the logo, but have NO idea where I could paste it to make it appear anywhere in my store.

I’ve already tried pasting it in the “arbitrary text or HTML” widget in my TwentyEleven WordPress theme, but that didn’t work. Any suggestions would be greatly appreciated.