Are you wanting to add some paypal add to cart buttons or what exactly do you want to do with paypal? If you want to create an add to cart button on your website then you need to go to paypal and they will give you the code to add to your website to make the buttons. Here is a link I found to the page with the paypal button code. https://www.paypal.com/cgi-bin/webscr?cmd=p/xcl/web-accept-to-sc-button-outside