Prerequisite: Knowing how to upload media files is required. For instruction on how to do this, check the "How to Upload Logos" section.
1) Using a browser (Chrome, if possible), go to this case-sensitive URL: http://WO-SIGNAGE-CMS/ContentManager
Login with these credentials for now:
http://WO-SIGNAGE-CMS/ContentManager is an internal web site that may only be accessible from specific locations.
2) Click on "Media"
3) You are now in the Media Library, which holds all the promotions to be played. Adding / removing items from here will add / remove it from the list of promotions within 20 minutes.
Images will play for 5 seconds apiece.
Items are played in random.
When choosing an image to upload: