Unzip the downloaded RabbitMQ tar file into a folder in your local machine. To unzip use; tar -xvf rabbitmq-server-mac-standalone-3.4.1.tar.gz
Start the RabbitMQ server using; ./rabbitmq_server-3.4.1/sbin/rabbitmq-server –detached (For detailed information on getting RabbitMQ started, stooped, etc please visit https://www.rabbitmq.com/download.html)