Getting Infinite Scroll to work

Hello,

I'm trying to get the Infinite Scroll plug-in to work on my husband's site. The plug-in is installed and activated but not working. I think the issue is with the settings. The plug-in has requested the following information:

Content CSS Selector (The selector of the content div on the main page.)
Post CSS Selector (The selector of the post block.)
Navigation Links CSS Selector (The selector of the navigation div (the one that includes the next and previous links).
Previous Posts CSS Selector (The selector of the previous posts (next page) A tag.)

My CSS is horrible. Could someone please tell me what these selectors are in the Atahualpa theme? I'm using Atahualpa 3.4.4.

Thanks,

Flur