There are a few styles that you can use to setup your affiliate portal.
The affiliate area allows your visitors to signup for an affiliate account. This is where your affiliates can log into their account and view ad code and real time stats. More details on this documentation here.
You can see how each of the affiliate portal/area looks like by clicking on the demo links below.
Use the following login credentials to log in as an affiliate:
Username: demo123
Password: demo123
1) Affiliate Area (embedded on a WordPress page style 1)