You can access your profile by clicking the gear icon located in the bottom left corner of the SHIFT interface.
Once you have clicked on Profile, you will see the image below. From here, you can input information like your company, website, location and even avatar by clicking on the default image above your name. Any information entered here will be visible to your company's administrators. Your name and avatar will be visible to clients on any links you have shared.
You can control whether thumbnails automatically fit or fill in your app display on the Preferences menu: