(to edit an existing user) or the
new user icon 
(to add a new user).Access this form by selecting
the Users node (within a database) in the
navigation pane and clicking
the design icon (to edit an existing user) or the
new user icon (to add a new user).
Name
Specify the user name of the database user.
Server Login
Specify the login name of the database user.
Role Membership
Specify to which database role the user belongs.