Use the Update Frequency box in the right column of the campaign editor. It reads Try to add a new post every … and you choose:
Each run adds one new post, if the feeds have a new article that passes the filters. New campaigns start at 60 Minutes. For example, 30 Minutes gives about 48 posts a day, 2 Hours about 12, and 1 Days one post a day.
Start Time is optional: pick a date and time and auto-posting begins at that moment. Leave it empty, or use a time in the past, to start immediately. Run Now always ignores it.
If a posting time for all campaigns is set in Auto Setup, a blue note in this box says so and that time is used instead.
Start with 25 free posts — no credit card needed.