Having trouble with my theme

If you go to my site http://www.artistsguildofspartanburg.org

My pages aren’t right and there’s a repeat of one of the pages “artists”. I tried moving the page to the trash and now it says Not found.

What I want is three things (which I had before correct)
1. Control over the pages being shown at the top
2. Control over what is shown first through last (left to right)
3. The drop down pages under the parent page to show (currently no drop down at all.

Is it the new update with my theme? My theme is Snow Summit 1.0.5 by weddingthemes.marriagescene.

Any help much appreciated