ah i love that tool ;) i always use i at work, cos im the only one who klnow how! :P well ours is a park one (600 quid!) but it'll be the same concept, BEWARE! this WILL mess your whole frame up if not used right!!!! Ok,
Take the threading part off the tool, Using your fingers, put it in, make sure you get the right side in each side (on park ones they have left on one of them, the LEFT goes in the DRIVESIDE. (Check just beofre doing it it might be different on different companies) anyway once its in finger tight then put the handle back on, Then Slowly turn the so the thread screws in. You will see loads of bits of metal come out but thats fine. then take it out, check bb fits and hopefully if you done it right it will do :D Ill try find parks guide to doing it, im not brilliant at puttint things in words, i can use it though no problem ;)
EDIT: http://www.parktool.com/repair/readhowto.asp?id=97 Id advise you to read that, thats parks way of saying how to do it, like i said im not very good at poutting things into words, good luck :'(