You can do it using the SM Gallery. First you need to create one.
1) Go to My Controls (link is at the top of the page to the left of View New Posts).
2) On the left side of the page that open click on Your Albums and then click on Create Album.
3) Fill in the Album Name and make sure you check that it is a public album.
4) Click Create Album. Now click on Upload Image.
5) At the bottom you click on the browse button and browse to where you picture is stored. Also fill in the caption.
6) Click on post image