Very easy and stable:
download, login as admin on your site and install.
Open module, give your google UA code in (copy paste from google) - offcourse you need a google account for this -
Enable the module (preferable in the lowest position there is (i.e. footer)) and it works like a charm!
Thank you for this simplicity!
Of course you can make a theme/template with google analytics integrated, but working with such a module has a lot of advantages (install / deinstall, enable/disable on certain sections of your site, make a duplicate install to even use more UA codes (on different pages)etcetera.