default parent page

Hi everyone.

I am trying to set my wordpress up so that when creating pages it automatically defaults to a specified parent page. I have set my site up so when a new user registers it automatically creates a page for them with the username being the page title but i need those pages to automatically become sub pages of a client part to the site.

i came across this in my efforts: https://www.ads-software.com/support/topic/default-page-parent?replies=9 however i could not get this plugin to work, i am guessing because it was written for WP2. can anyone suggest a way of doing this or possibly having a look at the link and telling me why it does not work for me.

many thanks in advance