Where to add 'EasyRotator' code for Header?

I am trying to figure out where to add the ID code generated from a new 5 picture slider image I created in the Easyrotator plugin. It says to add it in the Header.php under Editor in wordpress but I don’t know code too well. When I go to the Editor>Header file, I’m clueless as to where to put it and the link below wasn’t much help….

Here is the link where it attempts to show the location: https://www.dwuser.com/support/easyrotator/kb/template-function/

But of course, that code is very different from mine. I am using the ‘Coraline’ theme in WordPress for my blog at https://www.travelingroundtheworld.com
And I’m using WP version: 3.3.1