You just go into the gallery and click the + sign and then you either choose to submit art already exsisting in your gallery, or submit something entirely new. It has to be accepted by Ms.Erickson before it posts entirely though ^_^
Sorry about that, apparently my settings didn't save last time when I was going through the member settings >.< Try it again now, it should let you submit a request for posting art
Let me check the settings quick, they might have gotten switched around somehow, mine were switched back to being able to submit stuff without them being accepted first, so maybe members got blocked from submitting