Step 1: Visit Google Analytics
Visit http://google.com/analytics and click on Sign Up Now
More information about App Studio Analytics can be found here.
Step 2: Sign in using your Gmail account
If you don't have a Gmail account you will need to sign up for one before proceeding.
Step 3: Click on Sign up
Step 4: Enter account information
Complete the following information as required. For Website's URL, a good convention to adopt would be iphone.yoursite.com or appname.yoursite.com so that you know these statistics are from your iPhone/Android app(s).