Hi there, The information about roles, userIDs, Passwords, and profiles is stored in a SQL Database called ASPNETDB.mdf . You can find this DB by clicking on the App_Data folder in your solution explorer. Now where does this DB come from automatically? It's not magic. Whenever you set the authentication mode in the Configuration utility, An ASPNETDB is created and all the information about roles and userIDs etc, is stored in this Database. And whenever you say that this role should do this, it is from this DB the data is fetched. Hope it helps.
You don't have to be AFRAID!