How do I exclude testimonial categories from my sitemap

Change the following in your theme’s functions.php or sitemap.php file:

Before:

<?php wp_list_categories('sort_column=name&optioncount=1&hierarchical=0&title_li='); ?>

After:

<?php wp_list_categories('sort_column=name&optioncount=1&hierarchical=0&title_li=&exclude=8,10'); ?>

Make sure to replace the category IDs 8,10 with yours.