What version of Premiere Elements are you running on your Mac computer? Or, for that matter, is your "elements" really Photoshop Elements (photo editor) and not Premiere Elements (video editor).
If your program is Photoshop Elements, then you have posted in the wrong forum. Somehow your thread got posted in the Premiere Elements Forum. If this is the case, then please repost your thread in the Adobe Photoshop Elements Forum or wait for a moderator here to see your thread here and more it from here to there.
If Premiere Elements and your version is 12/12.1, then are you trying to work with Adobe Revel in the Add Media/ section as well as the Publish+Share/Private Web Album? And, how many photos, what format, and what pixel dimensions going to the Premiere Elements Timeline? What are your omputer resources.
We will be watching for your follow up.