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After signing in, click the Revisions button.
You will see a list of previous revisions of the page, like this.
Click on a date to view that revision.
Locate the previous version you’d like to use and
Compare two different versions of the page to see the edits and highlighted changes. This is similar to MS Word’s Track Changes feature.
Click the radio buttons on the right, next to two different revisions.
Click the Compare Selected Revisions button.
Drupal will highlight any differences between the two revisions.
After verifying the changes and locating the revisions you want, click the Revert button next to that revision and confirm the change. This will switch the page to that selected previous version. The old revision will be saved as a new revision.
