The User Profile tab contains much of the information about a user that is not often edited.  As a result, this tab displays various user profile information rather than containing a vast number of editable fields.  To make changes to a particular section, click on anything within that section to populate a modal window that will allow you to make changes.

Changing the User's Picture

If you need to add or change a picture for a user, simply click anywhere in the User Account Information section to open the Edit User Account Information modal, as shown in the figure to the right. Click on the Choose File button in the Profile Picture field to change the user's picture.