The user ID will allow the user to log into the company.
From the Setup menu, select Security Manager.
Or, click the 
Security Manager icon on the Setup toolbar.
Click the blue Users tab in the upper left corner of the screen. The list of existing users will display in the left pane of the screen.
Type the new user's first name, last name, and password in the appropriate fields in the upper right section of the screen.
Type the user's e-mail address and any additional description in the appropriate fields.