I have a code from PayPal to create my "buy now' button but I want to embed my registration form to connect with that. (I don't want the form to show)

I don't want to show the form until they go to purchase..  This is a horrible way to get technical support.

There is no need to use your PayPal button code in the form.  Create your form and add a PayPal field to the form:

https://www.jotform.com/help/50-PayPal-Forms

All you need to do to link the form to your PayPal account is enter your account email address while setting up the PayPal field.

If you have further questions, let us know and we will be happy to help.