Google Android 2.3 User Manual page 351

Market
1 Open the details screen for an application.
You can do this by browsing or searching for the application and then touching it;
or if you've downloaded the application, by touching it in the list of your
downloaded applications.
Touch the stars under My review.
2
Touch the number of stars to award the application and touch OK.
3
Touch Post a comment.
4
Enter a comment and touch OK.
5
Flag inappropriate applications
If you discover an application with graphically violent, sexual, or otherwise hateful or
offensive content, you can report it to the Android Market team.
1 Open the details screen for an application.
You can do this by browsing or searching for the application and then touching it;
or if you've downloaded the application, by touching it in the list of your
downloaded applications.
Scroll to the bottom of the details screen and touch Flag as inappropriate.
2
3 Touch the reason you find the application objectionable.
Touch Submit.
4
Your comments are sent to the Android Market team.
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Android User's Guide