WordPress.org

Do I need to alter my site templates or theme

No. As long as your template has one of the following lines of code in the footer.php file:

<?php do_action('wp_footer'); ?>
<?php wp_footer(); ?>

Then the plugin can use a built in WordPress hook to automatically insert the information into your website. This should work with 99% of themes based on normal WordPress rules.

Additionally, the included widget can be used to insert the information in a sidebar or there are two plugin functions available to generate the output anywhere that PHP can be executed:

<?php lmf_generate_unformatted_output(); ?>
<?php lmf_generate_formatted_output(); ?>

Why Isn't XYZ Working

If you are having problems then you can ask questions, leave comments or find more information at the plugin's homepage: Last Modified Footer.