How do I add html code for my paypal payments in JotForm?

If you are referring to the PayPal button HTML code, unfortunately, it is not possible to add the code to JotForm. The HTML/Javascript codes added to the form will be trimmed due to security issues. Since your account is already holding a paid subscription, you may consider adding PayPal payment field directly to the form to receive the payments using PayPal. Please refer to the guide below that can help you wth adding PayPal to your forms.

https://www.jotform.com/help/391-How-to-Integrate-Form-with-Paypal

Thanks!