page navigation without a plugin.

There are several sites that that tell me they can provide page navigation icons without a plugin by using WordPress’s innate navigation function.

There are several sites, but here is the link to the one site I almost understood:

https://dimox.net/wordpress-pagination-without-a-plugin-wp-pagenavi-alternative/

It clearly states that the code snippet needs to go into the function.php file. That’s good, but does the author mean any old place, or at the bottom? Enclosed, or not enclosed in PHP tags? I don’t know. He doesn’t say, assuming I know, which I don’t.

Where I have the real problem, though, is knowing what he means when he says I must paste:

<?php if (function_exists(‘wp_corenavi’)) wp_corenavi(); ?>

into my template.

I don’t know what that means! There are over a dozen files in the TwentyTen theme. Which one do I place this call into? I’m assuming, maybe, the page.php, but he may mean the loop.php, or does he mean the single-loop.php? You see where this might confuse a green horn?

Can you tell me where a call such as this traditionally goes? Is it in the loop? And if so, where the heck IS the loop? Which file, which line (2010 theme)?

I see now that WordPress is not meant for non programmers, but I’d still like to try. Thanks for any help.

Barry