Not working with Twenty Ten Theme

Hi!

I’m trying to add 3 images to my navigation and the plugin seems fairly straightforward and simple to install and use, but it’s not working at all for me. I am using the Twenty Ten theme with a child theme. What do I need to do to get this to work?

The site I’m building can be found here:

http://designworktwo.mellestyling.com/

https://wordpress.org/plugins/menu-image/