WorkGuru lets you personalise your profile picture which is displayed at several points around the application.
To Change your profile picture, Click on your Name or the Icon in the top right-hand corner of the screen, then click "Change Profile Picture".
From the Prompt, Click Choose File, then select a picture from your computer.
Once you've selected your picture, you can crop it to size to display nicely as shown in the picture below.
Once you're happy, hit Save and your Profile Picture will be updated.