Step 1: Press on the settings button
Once you are in the Course Builder view you just need to press on the green cog at the top right:
This will open the Course Settings menu on the right hand side:
Step 2: Update your course information
From this menu you can edit your course title and image as well as the course description, target learner, language and more.
Step 3: Press on the Save changes button
Once you press on the save changes button your course will immediately be updated with the new information. You don't need to republish your course for the changes to take effect.