How to allow a paypal button on the form for people to pay?

Thank you for reaching support,

Are you referring to Payment Integrations where users can click on a button to initiate payments?

If so, yes, and it is offered on all plans. Here is the related guide: https://www.jotform.com/help/323-mastering-payment-form-integrations-with-jotform

Let us know if you have any further questions.

Best.