Set in Files or Settings.
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Admins/OP: Add SteamIDs to adminlist.txt, permitted.txt, or ops.json (e.g., Rust: ownerid STEAMID "name" "auth_level 2").
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Permissions: Plugins/mods like Oxide/uMod for Rust/ARK (upload to oxide/plugins).
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RCON: Enable in server.cfg (RCONPort=27020, RCONPassword=yourpass); connect via panel console or external tools.
Whitelist via bans.txt inverse or game-specific lists. Restart to load.