Once your training course tested (read the article "How to test my training course before its publication?" for more information), you can publish it.
Click on Publish training course
A message is displayed : « You are about to publish your training course. If you wish to add or edit an update message for your learners, click on "Cancel", otherwise, you're all set! ».
Confirm your choice by clicking on "Confirm publication" in the new popup.
The green dot previously visible in Testing is now in yellow (while processing) under "Published", then in green when publication is done.