Click on Photos on the menu (there are many ways to get here but this is easiest) Click My Albums
Upload directly to public area or create an album (see below)
Click to Add photos to this album
Select the photos from your computer.. (Hold Ctrl while selection to get multiple photos)
Selected photos will be uploaded (I used the Flash uploader - you can use regular if it does not work for you)
Add name or description to your photo and click submit.