First, upload your content, and then you can schedule your content using a schedule as follows.

Step 1

On the Manage page at the top right, hover over the schedule at the top right of the screen.

Step 2

Select "Advanced".

Step 3

Select "Time range". Set the start and end times.

Step 4

Click "Apply" at the bottom right of the schedule window.

Click "Save & Publish" below the preview window in the middle of the Manage page.

This article refers to how to upload content for a schedule.