Click on the menu in the top left corner (or the Suite tab depending on your version). Select Register Software from the dropdown menu.
Understanding Your PhotoPad Registration Code A PhotoPad registration code is a unique identifier used to unlock the professional or home editions of the PhotoPad Image Editor by NCH Software. While a limited free version is available for non-commercial use, the registration code is required to access advanced tools and remove trial restrictions. How to Get a Valid Registration Code Photopad Registration Code