Need A Featured Image on Homepage

I need a featured image on my Homepage of my Menu. I could add a featured image to my posts and other pages except my Homepage.
I tried to post my URL link on my Facebook status and my friends inbox and it would not post and get some type of error message.
I was informed by jetpack there’s no featured image, no picture that was detected by the social debugger.
I have no idea or could not find any instructions to add a featured image to my homepage.

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