Head to your dashboard.
Click on the Affiliates tab under Marketing.
Here, you will see individually invited (custom) affiliates up top as well as member (global) affiliates - these are rewards that anyone in the world can access - at the bottom.
To edit individual affiliates:
Click on the three dots next to the individual affiliate which you want to edit rewards for.
Then, click Manage.
You will now see the plan(s) for which custom rewards are already set. Click the three dots next to the plan reward you'd like to change.
Click Edit and proceed to make your desired changes.
To edit member (global) affiliates:
Click on the three dots next to the member affiliate plan you would like to change, and select Edit.
Adjust your percentage and save.
You can also edit this public-facing affiliate reward if you head to the whop's storepage, scroll all the way to the bottom, and click the blue Edit affiliates button.
