To edit our profile, first access it by clicking on the avatar at the top and select Profile from the dropdown menu. 

Then, click Edit profile on the page that appears. You can modify the displayed information as well as choose who can see your email address.

If you scroll to the bottom of the page, you will also see where to add or change the image that appears on the profile.  Drag an image to the marked area and save.

On the profile page, you also have a link to edit your preferences.