Add social icons to header

I would like to add social network icons to the header above my search box (top right)
digitalingest .com .

I would like to keep the rss, remove the email and add a Twitter, LinkedIn and Facebook icons approximately the same size as the current rss feed button.

I have read a number of posts about adding a widget and css, but I haven't been able to make it work. Not sure I quit understand.

Any instructions would be helpful.

Thanks.