Because the membership provider doesn't let me add more fields for any new user like Name, Surname, etc, I wish to store everything information right into a seperate database table known as Customers. How do you link the membership provider with this particular table, to ensure that when an Admin really wants to manage customers utilizing a seperate web page (not the buit-in membership provider page) it shows all the details within the membership provider as well as the information within the database table?

Thanks

You would need to link to aspnet_Users table. This article has an introduction to the membership provider tables.