Everyone could be GM if they at least know the GM Password. The command is:
/gm mysecretpasswordsource:
https://lifeisfeudal.com/billing/gmcommands.phpYou can open the server console by clicking either the key left to the back space (^ on my keyboard) or the key bottom right of the one explained before (¨ on my keyboard). Sure the char is different according to what keyboard layout you have.
If you don't want to enter the password everytime you can give the IS_GM aatribute on DB level (
UPDATE account SET IS_GM = 1 WHERE ID = <account ID of account you want to give GM access>). Command would then be only
/gm