Add a link in the Testimonial section widget

Hello,
First of all, super theme, thanks a lot !
I’m currently trying to add a link toward the partners configured in the Testimonial section (I don’t want to open the dedicated wordpress page in fact, only a website link would be sufficient for me), is it possible to do so ? I tried to put the link in the Excerpt field on the dedicated page of a partner, but it doesn’t seem to work.

Thanks in advance,
Aurélie