Online Documentation for SQL Administrator for SQL Server
Setting database user properties
Use the Properties section of the User Editor to create/edit a user and specify its attributes.
Name
Specifies the name by which the user is identified inside this database.
Login
If this option is selected, use the drop-down list to specify the SQL Server login for which the database user is being created.
Certificate
If this option is selected, use the drop-down list to specify the certificate for which the database user is being created.
Asymmetric key
If this option is selected, use the drop-down list to specify the asymmetric key for which the database user is being created.
Without login
This option specifies that the user should not be mapped to any of existing logins.
Default schema
Use the drop-down list to specify the first schema that will be searched by the server when it resolves the names of objects for this database user.