ARK : Survival Evolved mod install guide
Inside the GameUserSettings.ini file under the [Main Server Configuration] section, you will find the Active Mods text field.
Add the Mod ID’s as per this example: ActiveMods=4444444,731604991,1396711424 each mods separated by a , You can add as many mods as you want but keep in mind that the more mods you add the higher the risk of performance issues.
Don't forget to reboot your server after saving your modifications.
Give your server a few minutes to fully boot up.
2. Start looking for the mods you want to add in the Steam Workshop.