Click the "Create New Schedule" button:
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Name your schedule (perhaps according to the time of day). Choose a playlist from the dropdown list:
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Timing Options
Now you have a wide range of choices for how to schedule. Note that the "From" field is a dropdown that can be changed to "All Day" when you don't need this schedule to alternate with others.
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It's also important to note the Day dropdown offers quite a few choices to have certain schedules on certain days without complicated timing:
Mondays, Tuesdays, Wednesdays, Thursdays, Fridays, Saturdays, Weekdays, Weekends