Is this part of Photoshop Elements? I am not familiar with those terms in Premiere Elements.
If you ARE in Photoshop Elements, then we can move your post to that forum, but before we do, and mess things, up, we need to know the exact program, that you are using.
The capability to share to the photoshop showcase is available in both Premiere Elements and Photoshop Elements.
I have and use both Premiere Elements and Photoshop Elements. I have existing galleries from both products in the showcase and wish to add additional content to each of those galleries from both products. I did not see a way to do it other than to create new galleries.