This seems like a question that should be easily be googleable. It is not though. Can anybody help?
How do I create a new user for rabbitmq?
I have found this very useful
rabbitmqctl add_user username password
rabbitmqctl set_user_tags username administrator
rabbitmqctl set_permissions -p / username ".*" ".*" ".*"
See more here https://www.rabbitmq.com/rabbitmqctl.8.html#User_Management