Viewing and editing user information
To view or edit user information, navigate to Setup | Manage Users | Users. Now, click on Edit next to a user's name. Change the necessary information and click on Save.
Users can also change, or add to, their own personal information after they log in.
If you change a user's e-mail address and do not select the Generate new password and notify user immediately option, a confirmation message will be sent to the new e-mail address that you entered to verify the change of e-mail. The user must click on the link provided in that message for the new e-mail address to take effect.
If you change a user's e-mail and reset the password for a user at the same time, the new password is automatically sent to the user's new e-mail address, and e-mail verification is not required.
Click on Unlock to unlock a user that is locked out of Salesforce.
Note
The Unlock button is only available when a user is locked out after they have exceeded the maximum number of incorrect password...