To Modify one of your Special Offers :
In the Main Menu, click on Special Offers
Click on the blue Modify button at the end of the line for the desired offer
In the settings screen for the offer concerned, make all the changes, and don't forget toSave them
To delete one of your Special Offers :
In the Main Menu, click on Special Offers
Click on the red Delete button at the end of the line for the desired offer
The offer is irreversibly deleted