Tracking ID and Data Sharing
On the same page at https://www.google.com/analytics/, you’ll see a section called Data Sharing Settings. This one helps you configure which of the Google’s services can access your data. A rule of thumb is to leave all checkboxes checked.
Once you’re through with this, hit the Get Tracking ID button. After you’ve read and accepted the terms and conditions, Google will redirect you to your dashboard and provide you with your tracking ID.