Click on “My Stuff”.

Click on “Add my own stuff”.

You will be prompted to add a pic of any new stuff you wish to add.

Images must be a minimum of 300x300 pixels.

You can copy a pic by simply clicking “Add to my stuff” from any of your friends’ pages, the “Recently added” or “What’s Hot” pages.

You can also add a pic as you add new stuff (either when using the Add new stuff” tab in the left had toolbar, or when in “My Stuff” and clicking “Add my own stuff”. In both cases you will be prompted to add a pic (using either “browse” for your device” or “Remote URL” where you take a pic from another website. Remember it is your responsibility to attribute source etc)
 OR 

If you don’t have a pic there and then, you can still add to your stuff at a later date (it just won’t show in any of the rankings until a pic is added). To do this just, sort your stuff using “Date- Newest”, find the item and click Add photo, then follow the steps above Images must be a minimum of 300x300 pixels