Add it to your server
In your server's .ini file (servertest.ini by default), add these to the existing WorkshopItems= and Mods= lines, separated by a semicolon (;).
WorkshopItems=3818247787
Mods=PlayerMarkers
| Workshop item | Subscribers | Declared in |
|---|---|---|
| Player Markers - See Where Your Friends Are, Waypoint Arrows for Multiplayer [B42]3818247787 | 76 | description footer |