Adding users to the mySQL database

The db admin here is telling me that there as to be some standardized way of adding users to the database. I don't know anything about SQL. He is talking about the "ID" field or something like that. What is the standard way of doing this? We have an existing db of all of the user names and passwords, plus a lot of other stuff, that we can pull the user info from to populate the radius database, but he needs to know exactly how it has to be added. Googling in the mean time... -Doc