In GlassHive, you're able to schedule, edit, unschedule, and delete emails on a single page. On this page, you can view all the emails that have been scheduled and not just the campaigns. You can also see the emails that can be sent out using bulk actions or to a single person under "Contacts."
Go to the "Marketing" icon on the left side
Click on "Scheduled Emails"
Hover over the campaign you want to make changes. You will see on the right side, the options to: unschedule campaign, edit, duplicate or delete.
Note: If you want to edit the campaign, you'll have to unschedule the email first.