To delete a User:
Go to the settings icon and select Settings from the dropdown.
Select Manage Users . All the current users names are presented.
Find the user you want to Delete.
Click the x in the top right of the User's box.
*Confirm that you want to delete this user.
*Please Note: All contacts, emails, and notes associated with this user and/or assigned to this user will be reassigned to you (the person that deletes the user). Any history such as emails, tweets, and notes will now appear with your name as the author.