Once you have created your Workflow and checked for any errors it can be saved and then published. Select Save Version on the top right hand side of the screen.
As soon as the Workflow version is saved, the Publish button will become active. This gives you the option to publish a brand new Workflow, or add a new version to an existing Workflow.
Save New Workflow
Simply complete the steps in the New Workflow panel and hit publish.
Save New Version of Existing
Use the dropdown arrow to select the name of the Workflow you are updating and complete the rest of the sections as required.
Saving your Workflow