pop-up button/link

My client has long testimonials, so I have to shorten them and add a ... read all link or button. I tried the popup shortcode, but it doesn't work. Please advice. I also tried the button shortcode, but the onclick button function is not explained in the button shortcode docu. Please point me in the right direction :)

THX
B.

shortcode in testimonials not working: https://snag.gy/rZ8Ix4.jpg

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