I would like to modify the layout of the testimonials slider template. Can you please let me know where to find the file to be changed? I am using child theme, please confirm that it will work fine when the file is copied to the child theme directory and modified.
You can find template markup for testimonials element in this file wp-content/plugins/et-core-plugin/inc/testimonials/woothemes-testimonials-template.php. You can also override function named in your child theme functions.php.