Go to your profile and you'll see a new tab for photos! Upload any you like to tell your story, show us something about your life, share your most favorite (or maybe least favorite) people, places, events, things -whatever.
The upload is simple: navigate to the place on your computer where you have a picture (a jpg or png) and click to add it to your photos. Add a caption if you like. Same as everywhere else, basically. The picture will appear as a small version, but if you click it, it will get REAL BIG! You may also click your caption to change it (but nobody else can do that to YOUR stuff).
For a sample, visit my profile and see some shots I put up.
Enjoy!