The PIN Code function is available to Premium users only, but for a limited period of time, you can activate the premium version for free, by entering your e-mail address on the Settings Page. Here’s how to do it:
Visit the Settings screen by clicking the icon on the top-right corner of the screen on the homepage. In the section titled “Unlock all features of Time2Life” enter your e-mail address.
Save your settings, and revisit the Settings screen.
Scroll to the section titled “PIN code settings” choose your PIN code and activate it.