If you have already scheduled a Campaign, but changed your mind about the date/time it should start, or the Slack channel the campaign should run in, you can reschedule it in just a few moments.
Visit the Campaigns page, and find the campaign you wish to reschedule under "Your Active Campaigns".
Click the button with the '...' at the bottom right hand side of the Campaign card.
Choose to "Edit".
You can now proceed to edit the channel, date or time for the campaign.