Go to the order for which you want to assign commission. Under the 'Affiliate commissions' heading, click the 'Create +' button.
Select the product within the order and enter the email address of the affiliate. The commission is automatically calculated and displayed.
Click 'Save' to assign the commission.
Do you want the commission to be assigned on a recurring basis? Then tick this box under the product. This box is only visible for products set up as subscriptions or instalment payments.