cms elements

I’ve just created some new Pages for my site, each Page contains an element that I want my client to be able to edit. What code would I need to put into my index.php to have these various pages display?

For example, one of the pages I have made is called ‘intro’ as it contains some intro text that my client wishes to edit. How would I get only my ‘intro’ page to display in the ‘intro_container’ div I have in my index.php file?