Login to Bongo4U Admin Mode.

Hover over the "Testimonials..." option on the Page menu, then hover over the testimonial to be deleted, and click on its name.

You will see the Edit Testimonials form.

At the bottom of this form, click the "(Delete this testimonial)" link. It will ask for confirmation. Once confirmed, then that testimonal will be deleted from your site.

Note: If you accidentially delete the Testimonials block from your site, don't worry, your testimonials are still there. Just add the "Testimonial" block onto any page of your site, and your stored testimonials will resume being displayed on your site.

Additional Info: Read the "How do I Add a Testimonial" entry.