If you have questions about using mojoPortal, you can post them here.
You may want to first review our site administration documentation to see if your question is answered there.
I've just set up a new site using 2.3.7.6 (SQL) and discovered that it only contains the new artisteer 3.1 skins and the jquery one. I can get the others of course from the "extra skins" download, but I just thought I'd mention this in case it was not intended.
cheers