For your affiliates to get access to their accounts you need to register the users.
There are two options:

1st - Do it yourself.

To do this, click on New Affiliate user.

Then fill in the information about the user and give him access to the necessary sources.

Password must contain at least 1 letter and 1 number.

Remember to click on New Affiliate user button to create one .

2nd - External user registration.

With the possibility of external user registration ( Allow Sign Up trigger in White label settings), the affiliate has the option of self-registration.

After that, the registration must be approved by the manager, if the Approved by default setting is not selected in White label settings.