This quote from the installation instructions is useless...sty(le...misspelled)sheet_social_header.css doesn't exist in the downloaded package. Where can I find a copy of it?

stylesheet_social_sidebar.css is the only file in the css folder with the word "social" in it...

In your favorite plain text editor open includes/templates/responsive_sheffield_blue/css/stysheet_social_header.css

At the bottom of the file add display:none; to the class for each icon you don't want to display. So, for example if you don't want to display the facebook icon you would add:

.facebook{display:none;}

The classes used for the icons are:

.facebook-sh
.twitter-sh
.youtube-sh
.pinterest-sh
.google-sh
.blog-sh