There is a plugin which sticks first post on top but it was written for Mybb 1.2 is there something like this for mybb 1.4 ?
I remember seeing it around, here somewhere.
I'll go look and see if I can find it..
You posted this in the wrong section though, this hardly has anything to do with Themes or Templates..
I think your looking for @flash.tato's plugin "ShowFirstPost Plugin!". Do a search for it here as I can't find it over at the mods/plugins area.