It's embarrassing to be such a novice at all this, but I cannot figure out how and where to insert the code in my Atahualpa 3.2 theme.

Exact instructions: Copy the following code block into every webpage you want to track immediately before the </body> tag.

Can you help me out?

thanks,

Lisa

put it in ATO->HTML/CSS Inserts->HTML Inserts: Body Bottom

You mean put it in HTML Inserts: "Header", not "Body Bottom". See my site's the source page at http://wowmacrosguide.com

This worked for me to track Google Analytics

Or use one of the many Google Analytics Plug-ins...