According to the Salesforce documentation, the recommended way to change the scheduled send date for the email is to edit the scheduled email, select Wednesday for the new date, and save it. A scheduled email is an email that is set to be sent at a future date and time. A scheduled email can be edited or canceled before the scheduled send time. To edit a scheduled email, the user can go to the Scheduled tab in Email Studio, select the email, and click Edit. The user can then change the send date and time, as well as other settings, and save the changes. Editing the engagement studio program, deleting the engagement studio program, or deleting the scheduled email are not the recommended ways to change the scheduled send date for the email, as they are either unnecessary, ineffective, or irreversible actions. Reference: Salesforce documentation