You can't
U can't reset it
delete the game data files
you go to the android settings and it will tell you if you want to reset or delete
Check
You can restore you iDevice. That really works. I've tried it. Actually if you delete the app it will ask if you want to remove it from your Game Center. Just say yes, then re-download it and it should start you off fresh I have a full step by step here: http://clashofclansblog.paulbrucesamson.com/2013/09/how-to-restart-your-clash-of-clans.html The whole process takes about twenty minutes.
Transfer your account to another android phone and it wil start a new game
power on
You can reset the phone if it is an android. Moreover there is an option of forget password. It can reset your password if you want to.
Click on a network and select forget
At the moment it is impossible to delete and reset your game. You cannot start a new game unless you play on another device (in which case make sure you are not logged into the same Game Center or you will reload what you already had). However, you can delete the app by holding your finger on the app icon for several seconds until it starts shaking. When it shakes press the X in the corner to delete the app.
ignore it
go to settings the go to format