Straight after u bust the roll,pretty much a split second after (u dont really evn complete half the actual roll itself) turn ur board sharp and hard towards the bottom and face of the wave (45 degrees or a lil more than),the rest of ur body will follow in the motion.
Bear in mind u also have to look(point ur head) where the nose is going for it to do that.
By the time u land(if u stik it nice) all u should really hav to do is complete half a spin(ur usually almost facing backwards so just diggin ur fins and pullin urself round should do the trick) and u done it

Hope this helps u cos im the kinda dood who thinks about simple things in an overly complicated way

Hope u can picture it LOL...
b kiff.