Create a campaign and schedule it. Refer here on how to schedule the campaign.
Navigate -> Marketing -> SMS + -> Action -> Edit
- Editing the campaign is used for the scheduled campaigns.
- When clicked on the edit action from the list of campaigns, the edition of all the data (from Campaign Info to Delivery) in the campaign will be processed.
- You will be re-directed to the edit campaign page from there you will be able to edit before the campaign scheduled time.