how to add menus to gridmarket

How do you add a side menu to the gridmarket template. Under menu it states that the template only supports one menu but on the preview of this template there is one horizontle menu on top and a verticle menu on the side. I also noticed that there is no product link on my word press where before when I was using woo plugin and there was.

What I’m trying to do is add different catagories of products to my webpage and add the right products to the right catagories. I don’t see anywhere to add products or catagories. Please help