To upload a profile picture of yourself go to the COMMNITY page and click on your profile name.
This will take you to your PROFILE PAGE. At the top of YOUR PROFILE page there is a circle with a blank grey profile image in it. Click on this image and it will open a dialogue box where you can UPLOAD your photo.
If you already have a photo and want to change it click DELETE and then UPLOAD a new one.
TIP: The easiest way to get a photo of yourself is to take a 'selfie' with your phone or tablet