You can do this in your Post Sale by first unchecking steps 1 and 2. Then click on the pencil and paper icon that is in step 1 next to "send WBN". Make the changes you need to make and click "Save".
I hope this helps. If you continue to have trouble with this, please let me know an example of exactly what you are trying to change, and on which order, and I will take a look.