To setup your Google Analytics, you'll need some information which you can receive from your Google Analytics dashboard. First setup your domain. If you've already got this done, you can skip this step.
After this step, get your 'Tracking-ID' and copy it, by selecting the options below:
Once copied, go to the 'settings' tab on your page:
After clicking that, scroll down and paste the Tracking-ID you just copied in the box shown here: