[Koha] editting opac-main.pl

hi i'm using koha 3.12 and have been having trouble creating and displaying custom pages. I followed several tutorials unsuccessfully until i was lead to this link; http://wiki.koha-community.org/wiki/Koha_as_a_CMS but the opac-main.pl i have has different parameters to those suggested in the link for editing in order to be able to set the url link template for custom pages.