Each user has ownership over their own account meaning they can modify their names, update e-mail addresses and passwords on their own - including approvers.
To get started, click your e-mail address at the top and choose My Profile & Password from the User options.
My Profile & Password options
In this section you can upload a photo, change your e-mail address, names, turn on or off notifications and change your password.
Once you're done just click Save.