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White label means they are presented with your companies branding as they buy the domain.
An example would be...
You sign up as an affiliate of a domain registration company, they provide you with an html form to put on your site. When a user on your site uses the form the user it taken to the registration company, but the site looks like yours.
Once there they buy the domain they are sent back to your site. The concept of white label affiliations is to make the purchase seamless to most users, they will think they bought the domain from the same website. This may however lead to a lot of additional support requests from domain customers.
We arent allowed to mention specific companies here but if you search for companies that offer such services you should be able to find something that will work for you.
Hope this helps.