Links on portfolio

Good morning

I’m using the certify theme for my website romain-megemont.fr

I would like to put links on the portfolio section (“Mes productions” on my website), but I can’t find how to do it. When I click on a picture from the portfolio, nothing happend. When I click on the title right below, that brings me to the top of the home page.

How to choose the hyperlink when someone clicks on the picture or on the title ?

Thanks

Romain Megemont

The page I need help with: [log in to see the link]