swarmctl -U User management

swarmctl -U shows you, and allows you to change, the list of admin users
run without options shows you the list of admin users
requires -p [user:password] if you are not using default admin credentials
use -V [password] to add the password to a new user, specified like: swarmctl -U [new admin user] -V [password for new admin user]
change password for existing user like: swarmctl -U [current admin username] -V [ new password for admin user]
be advised when changing the admin password that other systems might have the admin password set and could potentially break if changed until they are updated

swarmctl -U shows you, and allows you to change, the list of admin users