Google Analytics is a free service that provides excellent in-depth website statistic reports. If you do not yet have an account, make one at: www.google.com/analytics/
Integrating Google Analytics with Your Website
STEP 1: Once your Google Analytics account is setup, copy your Tracking ID (will appear as UA-######-#).
STEP 2: Log in to your website dashboard (if you don't know how to do this, click here). When you're in the dashboard, click on the Design tab and then click the Google Analytics tab.
STEP 3: Paste your Tracking ID in the Google Analytics Account field and click Save.
Your Google Analytics account has now been integrated with your website!