You can provide users to a customised white label user portal with your own branding, but first you will need to create the main user to have access to this portal.
To create this user, navigate to the Edit Customer screen: Customer > List All > View > Portal Login Information.
Once you have set a Username and Password for the user, they will now be able to access the white label portal using the credentials you have setup for them.
Related Topics:
Setting up a Hosted Voice Account
Create a User for White Label Portal