Advert Log
Click Start Editing Log to being editing the Advert Log
Click Schedule to populate the Advert Log with adverts. If the advert log is not populated then ensure there are Advert Block items in the playout log for the hour you are trying to schedule.
Use the Add Item button to manually add an advert to a block in the advert log.
Click Save to persist the changes or Revert to discard the changes.