When you install the app, your shop's affiliate portal is setup as per your store's name. For eg. if your store's name is Hello World your affiliate registration portal is setup at
helloworld.goaffpro.com. You can change this to
anyotherdomain.goaffpro.com from the admin dashboard (in Settings) If however you would like to set it under
affiliates.yourdomain.com (i.e. under your own domain) you need to do the following
Open Settings in the App. Select General Settings and Scroll to Partner Portal Subdomain option.
The whole process takes about 10-15 minutes.