You can display testimonials on your site in lots of different ways. Here is an example of how you can set them up in a few minutes on your site. If you'd like a simple service that does this for you, then you might try: https://www.powr.io/plugins/testimonial-slider/standalone. It allows you to create a free testimonial slider and you can then use OfferingTree's "integration" feature to embed it on your homepage or somewhere else. (below are the steps to do that)
Step 1: create your free account and set your content up at powr.io (using the above link). The free account lets you have 3 free testimonials. Once you've set up your design, content, etc., then you can hit "Publish" in the upper right.
Step 2: Copy the "embed" code that powr.io gives you by clicking on "Embed Code" and then "Copy Code"
Step 3: Go to your OfferingTree site and click on "Home" and then click on "Edit Text" under the about section, then you can click on the "+" button and then "</>" to insert a new page integration:
Step 4: Create your new "testimonial_slider" and then paste in the embed code you got from powr.io in Step 2 above into the "Integration Code" box and then hit "save"
Step 5: Now you'll see new text below that shows your new integration (e.g., "testimonial_slider") and a "select" button, you just need to choose "select" and it will insert your slider onto your homepage.
Step 6: Your homepage will not include new grey integration text that says "Testimonial_Slider" and the only thing you need to do now is hit "Update Home Page" to save this testimonial integration.
Now, when you visit your website's homepage, you will see this testimonial integration slider. You can change the look and feel of the slider by making edits in your powr.io account (see Steps 1 and 2 above) and the changes will automatically update on your website. If you don't want to use powr.io, then you can use other services too like: https://elfsight.com/testimonials-slider-widget/. The steps for integrating the testimonials on your site is very similar to the above.