@vitopablocasamassima
To start tracking the authors, you need to set up custom dimensions in your Google Analytics:
https://support.google.com/analytics/answer/2709829?hl=en
You can add up to 20 in GA, these are the ones I normally add:

After you have GA set up to track those custom dimensions, you need to set up GAinWP to “tag” that information that is being sent to GA by going here on your site:
/wp-admin/admin.php?page=gainwp_tracking_settings#top#gainwp-custom
Just match each option in GAinWP to the number of the custom dimension in GA, for example mine are:

One last step is you need to create a custom report in GA to view those new custom dimensions.
There is a decent tutorial on the Exact Metrics site part way down the page:
https://www.exactmetrics.com/the-beginners-guide-to-custom-dimensions-in-google-analytics/
Search for “Find Custom Dimensions Report” and read from that point on.
