[Zope] Upgrading 2.1.6 to 2.2.0

Hi all, I want upgrade the zope 2.1.6 to 2.2.0 and hold all my directories and application that i created. I tried with the documentations and I succeded to get them, but i have authentication problems and couldn't view them. Could anbody tell me in details how i must do it to upgrade it succesfully point by point? I don't really understand the thing with ownership. Could you explain it me, please? Thanks for help! $Regards MM