If you will be receiving PayPal payments please ensure you have a PayPal account. Once your account is created, and you've connected it to your bank account or any other account, you'll need to enter that email in the portal.
How to add a PayPal email as a Partner?
Log into your partner account and head to your Account & Settings tab and select My Account. Click on the pencil icon in the top right to edit, and enter your PayPal email in the designated field. Remember to press Save!
How to add a PayPal Email for a Partner?
If you'd like to add a PayPal account email on behalf of your partner you'll want to first click on the Partners tab in your portal > Select the Partners name > click on the Details button > click the pencil icon to edit > enter PayPal email in the Payment information section.
Remember to press the Save button!
Once the PayPal email is entered, your partner will now be able to receive commission payments.
For more information on how to enable PayPal, please see this article.