Get your Tracking ID from your Google Analytics.
On the next page, just copy the Tracking ID at the top.
Once you've copied your ID, go back to the Pure Chat dashboard and navigate to the Tools menu.
Under Integrations you'll find Google Analytics.
Check the Enable Google Analytics box and paste your Google Analytics Tracking ID in the specified text field.
Once that option is selected, just check the other boxes to specify what statistics you'd like to keep track of.