I struggled a bit with that section myself, and when searching for a solution found many others struggling with the same issue, so I thought it would be useful to add a tip :) 

It might be better to not have a tip, and rather make it part of the normal text of that section? Either way, I found the whole cake book straight forward except that specific section...

It seems as though some one provided a fix, (and you approved it), but then Ceeram changed it to status "works-for-me". Reference: 
https://cakephp.lighthouseapp.com/projects/42648/tickets/1485-bindnode-still-creating-user-model-aros

Other people struggling with the same issue:
https://groups.google.com/forum/?fromgroups=#!topic/cake-php/GnWPVREJHZ0
etc