To Manually Rewrite the article please follow the below process.

Step One: Open Posts menu, and click on post name to edit the article.

Once post is open in edit mode scroll to the very bottom of the page. there will be a section by name "WP Auto Rewriter", please refer below screenshot 

Click on Rewrite the Post Button

Once post is rewritten you will be able to check the changes wpAutoRewriter has made, you can change synonyms by hovering your mouse on words and then select the desired synonyms, please refer below screenshot

Once all changes are made click on "Update content in Editor" to add rewritten content to post.