You don't need to go to the Users menu to edit your profile; you can now click on the shortcut My Profile.
If you have the edit access to your profile, you can edit all fields in the Private Panel, or else you will need to request the changes from your admin. Also, it is a general rule that only admins can edit the Public Profile.
You can also add documents and edit your notifications.
Once you've completed the necessary changes, hit the green button to update your profile.