Scheduled campaigns can be found under the 'Messaging' section of the menu. On the 'Scheduled Campaigns' page you will see all your current scheduled campaigns and their statuses. You can edit and delete them by clicking the crayon and the trash can icons.
To set up a campaign that will repeat its deployment on a regular basis, e.g. Weekly or Monthly you can use scheduled campaigns. These are set up in the same was as Standard Campaigns, except "Schedule Options", where you can select the regularity of your campaign with your other campaign options.
Read more on Creating a Standard Campaign.