Hello apeseeds01,
Thank you so much for using our theme and thanks again for using support forum for your questions. As per your questions, you can manage every entity of the testimonials from Appearance > Widgets > Home Main Content Area > AT Testimonial Section and use the available options of the widgets.
All the options are available there, if you need any more features and functionality, additional theme customization is needed.
If you have any query, let us know.
Regards,
Acme Supports