Security :: Create Store And Inventory Management System

I am a first time user of Microsoft Visual Web Developer. I am using it to create a Store and Inventory Management System. The app has four types of users - Administrator, Sales Person, Inventory Manager, Sales Manager. I have created four roles for the above user types and created folders under the root directory accessible only to each of these four roles. Now, an Admin should be able to create or delete the other three types of users. I have created a CreateAccount.aspx page under the admin folder using ASP.net Login controls. But in order to reach that page an user has already has to be logged in as Admin, so the CreateUserWizard control is not working. Could anyone tell me how to structure my app, so that the admin is able to add or remove other user accounts?