To share your page with the right title, description and thumbnail image, simply follow these steps. First select the gear icon next to the page you want to share on Facebook:
Scroll down and fill out your message Title, Description and Image:
After filling out the fields with your desired info, copy the link of your page (NOTE: make sure it's published!) and paste it on Facebook.
Is the right image still not showing?
You might want to debug it by pasting your funnel link in here: https://developers.facebook.com/tools/debug/sharing/
That should do the trick!