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The screens you see in this document may appear slightly different depending on whether or not you have the "Advanced" button clicked or not and also if there are other Payment Methods already configured.
After clicking the Payments button (#3 above), you'll see the following screen:
Click Toggle 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.
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Click the Save button to save your settings.