Adding Paypal as a Brand is required to sell your products on other partner stores. 

If you are looking to setup as a Seller read this article instead.

Before you start:

1) Paypal Email: Signup for a paypal account to receive payments here

How to:

1) Go to settings in the Ally dashboard

2) Click the Brands Tab

3) Make sure the switch is turned on 

4) Enter your paypal payout email 

5) Click Save