The two revisions of the article you selected in the previous step are displayed side-by-side.
The heading contains information about the revision name, date created and by whom it was created. Below that the content of the article is shown.
If it is possible to do a rollback there will be a link "Rollback" displayed to the right of the revision name. Use this if you want to revert to that revision. Otherwise click "Back" to go back to the previous page.