Sure!
1. On the codecanyon downloads page, go to the “downloads” tab and click the 5th star, see this screenshot.
Then a pop-up will open, where you can add more details if you want to.
2. Optionally, if you want, for the plugin repository rating, first you go to the reviews page. Then if you have an account, you can log-in, if not you can register too. After successful login, you can now leave a rating on the the reviews page, if you scroll down, there is the form.
I hope this helps 🙂