Sign in to your Goodpickle account
After login make sure you are in the "My Account
Click on the "Testimonials" tab.
Click on the "Approved" sub tab.
Find the testimonial you wish to remove and click on the "(x) Remove)" link. This will put your testimonial in the "Removed" section which holds testimonials not viewable to the outside world.
Please note that by removing a testimonial you are essentially removing a page from your Goodpickle profile. By doing this you run the risk of having the selected testimonials page on Goodpickle dropped from search engines such as Google, Yahoo or Bing. Only do this if you truly wish to remove the testimonial.