Ok I found how to add new pages.
As an example I added "Gift Voucher FAQ"
I open all the dyn_information.php and found everywhere that has INFORMATION_FUNCTION_ABOUT
Now I copied and pasted it.
Now I edited the new line so that it now looks like INFORMATION_FUNCTION_GVFAQ
Anywhere in the lines I copied and pasted, if I saw "about_us" change it to "gv_faq"
Did the same for the define statements.