Click on the menu (hamburger icon).
Click on “Affiliate program.”
Then click on the "Go to Affiliate Dashboard" button.
In the affiliate panel, click on "Withdrawal." 
Click the green "WITHDRAWAL" button on the top right corner.
Type in your Bitcoin wallet address where your affiliate earnings will be sent to (1).
Finally, click on the green "Confirm withdrawal" button.
You will see a confirmation notification for this withdrawal request.
That's it! You have now successfully withdrawn your affiliate earnings.