How do I set up Featured Items so it appears only in the top level of the categories, but not the lower levels?

For some reason, some code to the /includes/modules/[MY TEMPLATE]/featured_products.php doesn't appear on the lower levels, only the top level. I was trying to fix it, but then came to the realization that I probably don't want it on the lower levels anyway.

(If it helps, I am very friendly with HTML, CSS and PHP)

Thanks!