In the absence of Enterprise Manager, here is how to create and configure a login using OSQL:
- sp_addlogin 'userid','password','defaultdb'
- sp_adduser 'userid'
- sp_addrolemember 'db_owner','userid'
To switch MSDE to use 'mixed mode' authentication, set the registry key:
HKLM\Software\Microsoft\MSSqlserver\MSSqlServer\LoginMode
to '2' ('1' is Windows authentication mode only, the default).