Added a page to my account

I want to sale t shirts, how do I add my paypal to the page??

You will have to add the Paypal Payment Field in your form so you can add your Paypal Credentials on the Payment Wizard.

Please check this guide to understand the basics about  creating your first order form using the Payment Tools. https://www.jotform.com/help/165-Setting-Up-Your-First-Order-Form

If you have further questions, let us know.