1.) With the lock cable engaged, (setting 000) hold down the silver button located on the side of the lock, while rotating the numbers to the desired (new) setting.
2.) Release the silver button at the new lock setting.
3.) The lock is now set to the new setting. Be sure to note this 3-digit setting in case you forget."
Youtube would also save you, the TSA locks are fairly simple to pick and therefor to reset. You can buy a set of master keys on ebay, or make your own from plans on the web. Essentially different shape skeleton keys, not at all secure.