White labeling is available on any multi site plan, starting with the 5 Site Bundle plan. Purchase any bundle and then you will be assigned a "White Label" website, which you can brand as your own.
Under the "White Labeling" tab under site settings, you can entirely tailor the logo and colour scheme of the platform and use it completely as your own, for your customers. Here's a video that shows you how:
The White Label website can also be used to design the site for your white label platform, including a login and register button for your customers.