1. Open the Project that contains the mailing you want to edit.
2. On the Project Dashboard, click the "Manage" button in the Mass Mailing area.
3. Click on the scheduled mailing you would like to edit.
4. At the bottom of the mailing screen, click "Set as Draft".
5. The page will refresh and now you can edit the mailing. You can then save it as a draft, schedule it to send later, or send it immediately.