To view and manage the users in your organization,

Click Your Name | Setup | Administration Setup | Manage Users | Users

1. Enter the user’s first name, last name, and email address.
   • The email address becomes the username. 
2. Select a User License.
   • The profiles available to you depend on the user license you choose.
3. Select a profile to control what permissions the user has. (For example, System Administrator)
4. In Professional, Enterprise, Unlimited, and Developer Editions, select a role from the list defined for the Role field.
5. To set a user’s initial password, check Generate new password and notify user immediately to have the user’s login name and a temporary password emailed to the new user.
6. Click on Save button to save the User.