You will need to login to your Google Analytics account and get your tracking ID before you can add analytics tracking to your website. It can be found on the Google Analytics account home page. You do not need any other information.
In your Website Builder editor, click Manage and then Analytics. Enter your Google Analytics Tracking ID and click Save.
Note: Do not paste anything except for the tracking ID. Do not follow any other instructions from Google or elsewhere about adding scripts to page headers—it's not necessary for the Website Builder product.