Products aren't showing up on Shop Page

Hi, I am trying to add products to my Shop page, but when I make the product visible and published, it doesn't appear on my Shop. Also, the Manage Products button doesn't do anything when I click on it, so I can't add a product block manually into the shop page, if that's what that button is for. Any help would be greatly appreciated! Thank you.

My website is:

www.mindfulrelease.com