Pop-Up using Image Needs to Link to Outside External Source

This is the code I found, that creates a pop-up when my customers click a link for Prop 65 on certain product pages. (Shout out to Alex for the code base):

California Proposition 65

I need this image in the pop-up, that if clicked, will take them to Califonia’s website that has full information about Prop65.

Cannot figure out how to do this. I know it is a ref, but how do I write it and where does it go?

Website: https://novatto.com/products/30-inch-bath-vanity-with-cafe-quartz-counter-nobv-30cm-6001 (click on the “Product Guide” tab. Last link in the tab, when clicked, initiates the pop-up.)

Thank you for any help/insight-