You can change the author of pieces of content (such as pages, blog posts, comments, and attachments) using a CQL query and Change Content Author. The Page History and the Last Modified author of the content are saved. You can only change the original Created by author.
Follow these steps to run the built-in script:
Enter a statement, like creator = username, to select content to work with for CQL Clause.
Click Show Examples to reveals more CQL examples.
Select the author to work with by using their username in New Authors.
You can select Preview instead of Run to view changes before implementing them.
Once you select Run, the Results of the script appear.