In the game
Open the console (Tab on PC, or Enable Console in options), then enablecheats <ServerAdminPassword>. Now cheats work, e.g.:
cheat god,cheat fly,cheat walk,cheat ghostcheat giveitemnum 1 1 0 0/cheat gfi <name> <qty> <quality> <bp>(items)cheat summon Rex_Character_BP_C,cheat spawndino <blueprint> 1 1 1 <level>cheat forcetame,cheat dotamecheat destroywilddinos: respawns all wild dinos (after rate changes or if levels look wrong)cheat saveworld: saves nowcheat broadcast Server restart in 5 minutescheat kickplayer <SteamID>,cheat banplayer <SteamID>cheat setplayerpos 0 0 0/cheat tpcoords
The full list is on the ARK wiki; Kowalski knows the common ones.
From the panel console (RCON)
The panel's console is connected to the server's RCON, so you can type admin commands there without playing: saveworld, broadcast ..., listplayers, doexit (saves and shuts down cleanly). No cheat prefix needed over RCON, and no enablecheats.
RCON is enabled by default on our eggs (RCON_PORT in Startup). External tools (ARKon, RCON clients) can connect to node1.penguhost.com:<RCON port> with the admin password.