random post list plugin

I am trying to figure out how to display a specified number of posts from a specific category or group on a page. For instance say I wanted to display ten posts and then refresh and they would be in a different order if there were only 10 in the group or show another 10 with no duplicates from a group that has more than ten.

I thought it would be easy to figure out, but I seem to be having trouble and this plugin doesn't seem to be working in MU:


I think that I can do it with that one, maybe someone can fix it or explain another way to do it.