John, I am not sure that there are any instructions but I clearly set mine up. If you are logged in, you will see your user name and icon on the top right of the black bar. If you hoverr the moue over this it offers a menu with two choices “edit profile” and “log out”. If you select Edit profile, you can go down the page until you reach Profile Picture at the end of Personal Options. It does have a link to an Avatar Application which might be useful but I suspect I just dragged my existing picture to this location. I already had a suitable Avatar which I created in PS and use elsewhere. As the software we use is WordPress you may be able to find more information on the WordPress site, if you are still stuck. Let me know how you get on.