Deleting 3rd menu

Hi, I am using Twenty Fourteen Theme and inadvertently created a 3rd menu …forgetting that the theme only supports 2 menus…. I can’t seem to remove the 3rd menu. It is a copy of the sidebar menu https://spiritsofsaskatchewan.com/wordpress/ and the one I want to remove is the first menu that appears on the left side in the sidebar?
Can you help with this?
I would also like some good advice on choosing an eCommerce plug in. I do not need pictures.. It’s a simple product as shown here https://spiritsofsaskatchewan.com/wordpress/index.php/home/slga-distributed-beer/ with a few additional columns… I don’t want to pay for a plugin and then find that I cannot use it…so any thoughts.
Thanks