This image allows you to record your terminal in a docker container. You can upload it any time you want (private or public) authenticate with your already existing Account and share your terminal in seconds with your friends.
With the default setup you're already good to go. Start your docker machine and type
docker run -it argonqq/asciinema
You can also create an asciinema config file with your token
[api] token = <your api token>
More information for creating an Asciinema config file can be found here