If you need to change the commission on a placed order, go to your Orders screen within your Shop Portal. (You can also click here)

From this screen, you can click on the invoice number (in red) needing to be edited.

Click on the red edit pencil next to the commission amount to change the amount.

NOTE: At this time, Enlistly does not allow the shop to completely delete an order from the system as the affiliate has referred a customer for the sale.  However, if the commission was not earned (ie: due to the affiliate using the code/referral URL themselves for a personal purchase), then the commission amount can be changed to $0.