When you are at a stage to Approve or Reject an affiliate you will need to follow some steps.
1. First, go to the affiliate tab located at WC-Affiliate in your dashboard.
2. After that click on the review button.
3. And then you need to choose whether you want to approve the request or want to Reject the affiliate.
4. Write down the message in the message box and hit the Approve/Reject button.