In Glass we work hard to protect your information all the time, that is why we added an additional PIN number to access your account every time you log in. You don’t need to worry in case you forget your PIN, it's not definite and you can change it when you need to. As long as you are logged in Glass, your PIN access number will be the same so you don’t have to input your Glass credentials every time you use Glass on your phone.
If you ever forget your PIN number, you’ll need to reset it. To reset your PIN, just type an incorrect PIN number more than three times, and Glass will immediately log you out.
Then just type your username and password, and Glass will let you generate a new PIN number.
Remember that you can also use your fingerprint to access Glass.