Where can I find the Author Rating for a stock on the App?

On the article, about a specific stock, you will see the Author's rating for that stock in the "About this article" section, just below the author's name.

To see which stocks an Author has covered in the last year and the author's track record on those stocks, click on the Author's name on the left.

Under the Analysis tab. Below each article, you'll see Rating History, click on it, it will show a chart for every stock the author covered in the last year, with the author's rating history.