You control database access and administration with database users and roles. Database users are the logins that have the right to access the database. Database access roles set administration privileges and other database permissions.
For individual logins, you can grant access to databases and assign roles by completing the following steps:
Start SQL Server Management Studio. In Object Explorer view, connect to the appropriate server, and then work your way down to the Security folder.
Expand the Security folder and the Logins folder to list the current logins. Right-click the login you want to configure, and then select Properties. This opens the SQL Server Login ...