1. Go to SU01
2. Click button
3. Fill in all the required fields
4. Fill in all the tabs password and last name are mandatory
5. In the "logon data" tab , choose the right user type.
For end users you should choose Dialog user
5. In "roles" tab, add roles to user.
If you want to give all authorizations, in "profile" tab add sap_all and sap_new profiles.