You can change your profile image by clicking the pencil button on the right side of your Profile. A pop-up window will appear and clicking on the camera button will allow you to upload a new profile image.
You must click 'Save changes' in the bottom right corner for your new profile image to be updated.
Note: If changes don’t apply, clear your cache and cookies in browser settings. File uploaded has to be JPG/JPEG, to avoid automatic resizing upload a custom photo at 500px x 500px resolution.