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The base command is /hotpotato, with the alias /hp. Running it with no arguments shows the help page.
HotPotato in-game help page listing player and admin commands

The /hotpotato help page, including the admin commands shown to operators.

These need hotpotato.play, which everyone has by default.

Arena setup

All arena setup runs as /hotpotato arena <action> <arena> [value]. For the location actions, stand where you want the point before running the command.
Run save after setup. If anything is missing or only one bounds corner is set, the message lists exactly what to fix.