One more step I am not seeing. Choose Save after you do all of the above steps. You may have to scroll down on the page and on my screen it is on the bottom right.
Don't give up, we will keep helping you. We promised Adina. " Read It" :)
Opps A1 Parker and I must have been typing at the same time. We both agree, what might be going wrong is that you are correctly doing all the steps but the final step " SAVE" is missing.
Also, make sure something is written in the box next to the old picture. For instance, with my set up I have to go to the picture I want after browsing, then I need to click open which puts the address in the box next to the old picture. Then going to save should do it. By next week you'll be teaching someone else.
Has it worked? Did I forget to tell you that I usually have to try something like this at least three times before I have followed all of the directions!