Pauline I just figured my own out. Step one join the Mudcat group. Go to the Mudcat page and click on add this group. Step to go back to your own pictures and click on each one you want to add to the group. Over the top of the pictures are a bunch of icons. One says add this photo to group. When you click on it it will list out groups you belong to. Click on Mudcat and the photo will now be in both places. If there is a way to move whole sets I can't see it.

tinker