Enter the name of the app in the search field then tap the app.
If desired, tap Developer Website (if available - may require scrolling) to access developer's site.
The app must be downloaded to your device to review (i.e., you can only review apps you have).
Tap Ratings & Reviews.
If desired, tap App Support (if available) to access support site.
To rate the app, choose the star rating.
Tap Write a Review.
If presented with Sign In, tap Use Existing Apple ID.
To submit a review, enter the review info then tap Send.