The more data you give is the most information you get.

Give the details in these text boxes and then click resister/update and wait for some time; a snippet will be produced in the text area above copy button. To enable basic analytics for your site atleast you should specify Website URL in the text box above Alternate URL's.

Click on copy or manually copy the content and paste it in your web sites header/footer.

By specifying the URL's data can be accepted from multiple sources which are specified and data from other sources will not be accepted. Helps in gathering data from internal sites as well as live sites is collected in a single place for doing analysis.