On Notezilla 9 and later, you would need an order number to activate Notezilla . On Notezilla 8 and earlier, you would need an activation key.
To enter the the order number in Notezilla 9+ on Windows:
1. Right click on Notezilla icon (next to the clock) in the Windows taskbar.
2. Choose Register / Activate from the menu to activate the product.
To enter the activation key in Notezilla 8 on Windows:
1. Right click on Notezilla icon (next to the clock) in the Windows taskbar.
2. Choose Help->Register menu item. The 'Register' window will appear.
3. In the 'Register' window click on the 'Enter activation key' button.
Make sure that the name specified is same as the license name provided when purchasing the product. The key is really long. Make sure you copy the whole key correctly.