add a user with sql-plus

Hello I want to add a Sap-user into the database (on unix).

    I created the user registry on USR01, USR02 and UST04 tables, I can log-in with the new user but the profiles are not charged.

    I think thet I shuold put a new entry in the USR04 table, but on sqlplus I can´t find this table. Can somebody tell me where can I find this table?

Thanks in advance.

Angel