i got access to the Salesforce DX preview and I want to use the listed commands in order to make some testing, after been looking for a way to use it I don't really see something that says how to install it.
What basically want to do is to create an scratch org using this command:
heroku force:org:create -f config/workspace-scratch-def.json
Once I got access what should be the next steps in order to use the commands? I would like use the sample described here