How do I use the theme functions like `testimonials_count()`?

In your theme functions.php file, place code similar to the following for the configuration you need.

<?php
$args = array( 'category' => 'product', 'tags' => 'widget', 'limit' => 5 );
echo 'Here are response from ';
echo testimonials_count( $args );
echo ' happy customers who use our Product'; echo testimonials( $args );
?>