Removing Featured Image from Single Post

First of all, the theme works great, thanks so much.

I have been looking all over the web but can not find a working code or plugin. The plugin “hide featured” image does not work with newer wordpress versions.

So my question is

How do I remove the featured image from single posts?
It is uneneccesary for me to have the featured image seen twice in certain posts and it messes up the look of my page as well.

Can someone please hook me up with a css code or a work around?

Best regards