Insert code in wordpress html and show me

Closed - This job posting has been filled and work has been completed.

Job Description

i am loading live chat into my website and I need to insert 1 piece of code onto every page. The code must go between the <head> tags. I want you to show me on skype how to do this on my wordpress site so I know for next time.
This is a quick 3min job. here is the code
<!--Start of Zopim Live Chat Script-->
<script type="text/javascript">
window.$zopim||(function(d,s){var z=$zopim=function(c){z._.push(c)},$=z.s=
$.src='//';z.t=+new Date;$.
<!--End of Zopim Live Chat Script-->