first you open your ipod.then you go settings.from there you go to general.Then passcode lock.you press the botten turn passcode on.if you had passcode before you need to right your old passcode. then if you want to change your passcode you click change passcode it again askes your old passcode then you creat a new passcode.if this is your first time you again click to turn passcode on but this time it askes you to do a new passcode.