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After installation, the first step is to configure the app.
Configuration
A step-by-step guide is available here – Configuration Overview
Alternatively, take a look at the video:
https://youtu.be/aPeuL2IVALgReporting
Once data collection is taking place, you can move on to the reporting features. It normally takes Google Analytics around 24 hours for reporting to kick in, so while you are waiting, please familiarise yourself with the Analytics Reporting Features.