From a Home screen, swipe up or down from the center of the display to access the apps screen.
Navigate: Settings > Apps.
Locate then select the appropriate app. If system apps aren't visible, tap the Menu icon (upper-right) > Show system apps.
Tap Force stop.
Tap Force stop to confirm.
Tap Storage.
Tap Clear data. This option may not be available for some apps. Resetting an app or clearing data storage may delete saved info within the app (i.e., calendar events may be lost).