Products not showing under categories

Hi,

This is plugin is exactly was I was searching for so thank you!

This is my first website so i am new to all of this but after adding the short code, the menu has appeared and I can see the categories. However, when I expand each category no products are showing.

Can you advise on what I need to do to have my products listed under the categories?

Thanks,

Craig

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