To install Google Analytic you need to signup for Google Analytic account. For setting up new ac. please go to http://www.google.com/analytics. No need to create new ac. if you have a Google Account already.
2. Login to your Google Analytic ac.
3. Click on Add Website Profile
4. Put your website url, select your time zone and click Finish button
5. Copy the following code
6. Open your website each pages and put the code just before tag.
And you finished.
It will take up to 24 hours to start tracking.
If you are using your blog, you can put this code into header file.
Have a nice day.