When you first make a schedule, when saving you can choose to make the schedule Live and post it to the Web Terminal right away.
If you chose to save the schedule but not make it Live the first time, go to the Schedules pane in MSP. Select the schedule you wish to make Live, and click the "Make this schedule Live" button on the right. A window will pop-up and ask how to post the schedule online.
To create additional Live Schedule Posts, open your Live schedule and select "Create an additional Live Schedule Post" from the menu choices.
You can also go to the Web Terminal pane inside of MSP, click on the Full Schedules tab, and use the "New" button here to create additional Live Schedule posts related to the open schedule.