Adding "Number Replacer" Code into the Header

Looking to use a header replacer code for tracking where calls come from, adwords and the like.

Can this be placed in the header somehow?

<!– start number replacer –>
<script type=”text/javascript”><!–
vs_account_id = “Dog4pr1WMZDI8JaSon”;
//–></script>
<script type=”text/javascript” src=”//adtrack.voicestar.com/euinc/number-changer.js”>
</script>
<!– end ad widget –>

Also, is there a marketplace where I can hire someone more familiar than I am with Enfold to make some fairly easy changes??

Thanks in advance.

Jason