Follow along with the video below to see how to install our site as a web app on your home screen.
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Does it have an active data connection (WiFi or Cellular)? If yes, if you enter the PIN incorrectly a few times in a row, it should ask you to confirm Google account details and unlock.
Alternatively, log in to the Google account associated with the device on the Android Device Manager website and you should get the option to unlock/change the PIN there.
If you need to reset, it can be done via recovery. From memory, on most Samsung handsets, recovery can be accessed by removing the battery, reinserting, then turning on whilst holding Volume Up, Menu and Power. There should be a reset option in the menu that appears. Someone who owns a samsung should be able to confirm though.