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=3829464315
Mods=DuckHeadHat
| Workshop item | Subscribers | Declared in |
|---|---|---|
| Duck Head [B42]3829464315 | 13 | description footer |