What information is required to add the PayPal account to a registration form?

I'm having trouble integrating my Paypal account to the registration form. What is the most efficient way of doing this? 

The link to my form is provided below. 

Hi, 

Looks like you have your account set up correctly, but I noticed that you have set up Payment Type to accept User Defined Amount, when you do this, you will need to pull the amount from another field in your form, which should be a form calculation widget, this will hold the price that you need to pass to PayPal to process, and assigned to the Get Price From option in your PayPal widget settings, please see photo below:

If you want to pass a specific price to your PayPal widget, you would need to add a form calculation widget, and add your calculation there to calculate the price, then select that form calculation widget in the Get Price From, in your PayPal widget settings. 

This is all explained in steps in the guide below, please refer to it for more details:

How-to-Pass-a-Calculation-to-a-Payment-Field

Thank you.