You can set the URI for RabbitMQ service you want to connect. The URI should be followed to AMQP URI specificaion. (But you cannot specify amqp_userinfo part)
If you don't provide username/password, the below will be used as default.
Note that any existing connection will be disconnected if URI or username or password are changed during connecting or provides empty.
You can test connection using the blow test button. It does not affect to existing connection.