•Touch My apps in Google Play Store Home.
•Touch the application that you want to uninstall.
•Touch OK in the Refund dialog box. If the dialog box does not appear, your trial period has expired.
•In the survey form, select the answer that best matches your reason, and touch OK.
7.3Manage your downloads
After you downloaded and installed an application, the following further operations are available for your selection.
View
On Google Play Store screen, press Menu key and touch My apps.
Uninstall
On Google Play Store screen, press Menu key and touch My apps.Touch the application you want to uninstall to enter the details screen, touch Uninstall, and finally touch OK to confirm.
Refund
On the Google Play Store screen, press Menu key and touch My apps. Touch the application you want to uninstall for a refund, touch Refund and finally touch OK to confirm.
Update notification
On the Google Play Store screen, press Menu key and touch Settings. Touch the Notifications menu to select whether or not to be notified of updates,.
Rate
On the Google Play Store screen, press Menu key and touch My apps. Open the details screen for an application, touch the appropriate number
of stars 
to award beside Rate & review, and confirm by touching OK.
Flag
You can report an inappropriate application to Google Play Store by flagging it. On the Google Play Store screen, press Menu key and touch My apps. Open the details screen for the application, scroll to the bottom and touch Flag as inappropriate, enter the reason and finally touch Submit.
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