Go to the Admin tab and sub tab, Zone Management. There click the Zone Folders seen bottom left. Then, select the folder with the green plus sign in the task tool bar. Select the zone from the Zone Tag drop down. All zone tag options will reflect what you created in the main EnGage/Management/Tags area when labeling zone tags for a screen layout. Enter the zone reference size. This is the size of the zone in the screen layout. Refer to your screen layout for the OSM program to determine size specifications.
Log out and back into OSM to see the zone labeling applied to the Messages and Schedule Tab.