How to remove "featured post" header from sticky posts on Twenty Twelve theme

In my blog when i make a post sticky it comes first on the post list as i want but with a "featured post" header that i don't want.How can i delete the "featured post" header that's over my sticky post?
If you are referring to the Featured Post with the double bars above and below try the following CSS code.

First click “Appearance” and “Editor” Select and click“ Style.css
here's the CSS code from the file style.css which controls that section:

.featured-post {
display: none;
}

 Last click "Update File" for everything save.