Hi rkirby832,
The best way you can add the following code to the Testimonial content box.
<a class="testmonial-btn-link" href="#your-url">read more</a>
To open link in a new tab, you can use the following code:
<a class="testmonial-btn-link" href="#your-url" target="_blank">read more</a>
If you want to custom the style for this link, you can use the following CSS code:
.testmonial-btn-link {
color: #000;
font-size: 16px;
border: 1px solid #000;
padding: 10px 12px;
}
Hope this helps!