Ok, I figured it out! :)

Here's what to do...

tpl_testimonials_manager_default.php at line 53 add:
Code:
<div id="testimonialLink"><?php echo '<a href="' . $page_check->fields[testimonials_url] . '" target="_blank">' . $page_check->fields[testimonials_url] . '</a>';?></div>
tpl_testimonials_manager_all_testimonials_default.php at line 72 add:
Code:
<div id="testimonialLink"><?php echo '<a href="' . $testimonials->fields[testimonials_url] . '" target="_blank">' . $testimonials->fields[testimonials_url] . '</a>';?></div>
That's it!

I hope this helps someone else.