Go to http://google.com/analytics and click on access analytics. Now sign in with your valid Gmail account and click on Sign Up.
Now fill up the details, accept the terms and click on Create an account. You can give any account name. You can add as many sites under the same account. You can create other account and add another sites to it, so it looks systematic.
Click on the gear icon on left and flip to Tracking code tab.
Now if you want to track single domain like www.iblognet.com, select Single Domain. If you want to track sub domains like apps.iblognet.com, then select multiple domains.
Copy & Paste the tracking code right before the </head> tag of you website. Once you add the code, it might take an hour or more to detect the tracking code by Google Analytics. Once its detected the tracking status will change to “Tracking Installed”. See the video tutorial below: