It has been absolutely forever since I've done anything with my page but I'll take a shot at giving you an idea to try. However, I seem to remember that the last time I attempted to make some changes, they didn't come out the way I expected . . .
At the top of your page you should see an "edit" link. Click that.
Between the anchor and the broom icons there is some strange symbol . . . If you allow your cursor to hover over it, some words about "image" will show up. Click that symbol. Then, put the url of your picture in the appropriate box and click "Publish."
Thanks digits, I tried it with no luck, it's not a very user friendly program. I guess my page will have to be text only. I'm surprised there is no help section on this site unless I just haven't found it yet...