...
After clicking the Payments button (#3 above), you'll see the following screen:
Click the check box for PayPal.
The following screen will appear. Note that PayPal is now listed under the Methods tab.
PayPal Business Email
Regardless of what Integration Method you chose, you'll need to enter your PayPal business email in the first field. This email address is NOT the same that you use to log in to your PayPal account.
...