Install javascript on a Wordpress Site

I need a small line of code to be inserted into my Wordpress site just above the </body> tag. The problem is that on many of my sites, I cannot find the </body> tag. When you do find, I would also like an explanation on how you found where to place the script and how to find the </body> tag using other Wordpress templates. Below is how Tracking202 describes the placement of the code. Inbound Javascript Landing Page Code: This is the javascript code should be put right above your </body> tag on only the page(s) where your PPC visitors will first arrive to. This code is not supposed to be placed on every single page on your website. For example this is not to be placed in a template file that is to be included on everyone of your pages. This code is supposed to be only placed on the first page(s), that an incoming PPC visitor would be sent to. Tracking202 is not designed to be a webpage analytics, this is specifically javascript code only to track visitors coming in.