Publishing!
The final step is to publish your changes to the web. In the header of the Journal Column, there will be a new Publish to Web button:

Orange means there are uncommitted changes, green means everything is up to date. When you click the button:
All journals will be published to GitHub. If you have lots of assets, this can take quite some time to do a full sync, so please be patient.
When complete, whatever site you set up in the Module Setup page will pick up the changes, and deploy them to the web within a few minutes.
Happy Publishing!