How to integrate GA in my website?
In 2.2.4 Pro, you just go to Admininstration link in the admin and click add-ons, then install Google Analytics and insert your Google Analytics code and check Track ecommerce transactions. I assume the other versions are the same.
If you still unable to install GA… than go to index.tpl under your Skin–> Skin name–>Customer. copy and paste your GA code just before closing the tag and save it… that's it.