dont have a clue....kruskal wallis/MW

#1
hi
im currently doin the stats for my dissertation - but dont have a clue when it comes to spss.
i have carried out kruskal wallis on my data and have been told i now have to do a mann whitney post hoc test.
do i do this using results from the kw? and ive found mann whitney and post hoc but not together!????

thanks
m