Navigate to the Content Administration page by clicking on Content at the top left of the page, and find the page you edited in exercise 3.1.
Click the Title link to access the page.
Click the Revisions tab (see screenshot below for an example).
Image of revisions tab
Tip: When saving content changes it’s a good idea to leave a short but descriptive Revision log message. This can help you and other Content Editors understand what changes were made in each revision (which is particularly handy if you need to revert to an older version).