By following simple steps you will be able to customize the affiliate user profile fields.
1. From the Admin Dashboard, click on "configure sign up page".
2. From here you would be able to choose whether to copy the affiliate sign-up page link, customize, or view the signup page. On the same page, click on Customize.
3. At "Set Up User Page" you will find button for Form Fields click there.
4. At this page you can Add New Fields and also can change the order of these form fields.