- Make sure the new author has an account on your blog. If not, this won’t work.
- Go to the edit page for the post in question.
- In the upper-right corner of the page find the Screen Options tab and click it.
- Check the author box.
- Scroll down the page and you’ll no find an Author dropdown list.
- Change the author as needed.
- Click the blue Update button.
At any point page step 4 you can also close the Screen Options tab and/or uncheck the Author option as needed.