Website stats

I am wondering of there is a way to have statistics for one's site, such as visitor number, from where referred etc? as for example

We track stats by calling our Google Analytics script in theme/common/header.php. We use the same script as is used on our main site--no changes were made to make it work for Omeka.

Hm you are talking to someone who has very little tech knowledge, what does that mean? How do I access these statistics?

Before I go into more detail, are you using (hosted), or do you have Omeka on your own server?