That ultimately depends on where that information is getting pulled from. I see the theme is using some kind of tab feature, but I assume it's somewhere in the description of the product. I could be wrong though, I would actually have to take a look at your theme code to be sure. I can request access and take a look if you'd like. Just let me know, you can DM me your store url if you're uncomfortable sharing it here.
I don't understand, you want to add link for it? Because i checked and it showed: https://i.imgur.com/ZR7GKnv.png
If you want to add link you need to go to Customize > Product page, where you have entered this and add href for it: https://i.imgur.com/Ktr2edC.png
Hope it helps!