You can add multiple images to post as long as each has its own distinct URL. So you can find the URL from the gallery for the actual aspx, then use the picture control icon to bring up the dialog where you enter the URL name, etc. After you close that the photo will appear.
Now press the enter key several times until the cursor is UNDER the first image. Now use the same method as the first one to add a second image.
Here is my image URL: http://www.whatbird.com/forums/photos/mitch_gallery/images/3181/original.aspx

http://www.whatbird.com/forums/photos/mitch_gallery/images/9614/original.aspx