Not sure about how to put Google Analytics into a Drupal installation? Go take a look at Brian Stevenson’s videos on installing the Google-Analytics module. They’re Awesome!
Installing & Configuring the Google Analytics Module for Drupal 6.x
Configuring User Segmentation in the Google Analytics Module for Drupal 6.x
Advanced Tracking in the Google Analytics Module for Drupal 6.x
Advanced JavaScript Tweaks in the Google Analytics Module for Drupal 6.x
The Drupal module for Google Analytics can be found at http://drupal.org/project/google_analytics