Setting up the eBay Cash App is easy and can be completed in just a few steps. First, open the app and sign in. Then tap on the Settings icon (three lines in a triangle). Next, tap on the Shopping tab and scroll down to find the PayPal button. Tap on it and follow the prompts to create an account or sign in with an existing account. Finally, make sure that you have downloaded the eBay Cash App and entered your phone number into the settings section of the app. Once complete, you're ready to start using PayPal to pay for items on eBay!