Add Google Analytics
You can add Google Analytics to your theme by installing and activating this plugin. After you have activated the plugin, go to Plugins > Google Analytics by Yoast > Settings then Authenticate with your Google Account.
A pop-up will ask you to select your email associated with your Google Analytics account, select whichever applies, then copy the code it gives you. Paste this code into the next pop up box and save the changes.
You will then be able to go to Analytics > Dashboard and see your reports.