My dashboard doesn't have an option to set reward rules. It should have been under channels and links but cannot see it.
Dashboard image:
Currently, Branch is revamping the referrals system. It is not reflecting on your dashboard for the same reason.
Please check on this link via your branch account : https://dashboard.branch.io/referrals
It will show up the referrals section on your dashboard. Please set a reward rule as per your use and refresh the page. The referrals tab will now be visible for you.
Hope the above helps.