As you receive testimonials, you can allow them to show on your Testimonial Tree public directory profile. This directory is a complimentary benefit and allows your testimonials to be found when your name is searched on Google. You can visit the article on how to add testimonials to the directory here.
Select "Testimonials" then "Collect"
At the bottom of the collect page, "View Testimonials" will direct you to your public directory page. You can copy this link to share wherever you'd like.
Alternately, if you are looking to add the URL to an email signature, here are some help articles: