changing post order

Hi, I'm trying to change the order of my posts (ideally by a drop and drag or numerical method). See http://www.accessart.org.uk/sketchbook/?cat=8
To get these posts to appear in a different chosen order I used plugin: a stickypostorder. But when i use the plugin, the order doesn't change on my site. I'm asking for advice here and not on the plugin page because its the third plugin I've tried to do the same job, and none of them worked, so I'm thinking its a theme issue?
Any clues? Is it possible to change post order form within atahualpha? or are there any none conflicts with post order plugins?

Many many thanks - the theme has made my life much simpler!