Reportz referral system is simple.
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Send your custom referral link from this page: https://app.reportz.io/company/referrals to your friends from the digital marketing industry.
You can find it in main menu on the left.

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After they sign up, they need to add data sources, create at least one dashboard with at least 10 widgets.
After that they will be considered active users and you will get 3 dashboards for free for as long as your account is active (so, almost forever:).
Additionally, your friend will also get 1 free dashboard.
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You can track how many referrals signed up with your URL, and how many are active. 

Here is a quick video which explains how referrals work:

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