Aweber Autoresponder - how to add snippet code to wordpress theme

Hi guys,

I know this is probably going to be obvious to some of you - but I want to add a pop over opt in email box to my website www.racingprofits.net - the site is a wordpress site using the Atahualpa theme. I have set up the autoresponder with aweber and created the Web Form - I have now copied the HTML snippet and need to place it in the code for the site but do not have a clue where to paste it.

Any advice would be great.

Thanks,

Rich