Select which content you want to edit, Published, Unpublished or Drafted, and Click on Search.
You can also search online learning content with Class, Subject, Chapter & Topic (If it is under Published or Unpublished Content, you get an option to select Publish from and Publish to dates) and click Search.
Now you have the content, look under Action and Click on the Pencil Icon
Make required changes in the Online Learning Content
Now Look at the Bottom Right Corner and Click on Save & Publish.
You can also Save it in Draft by Clicking on Save as Draft and See the Preview by Clicking on Preview.