Start PageSeq from the program menu or desktop.
The first time you will see the registration dialog. Run in demo mode or complete registration here.
If you click register, you will given the an activation dialog which contains the Hardware ID associated with you PC. This should be used to register and obtain a Product Key.
Once you get a Product Key, copy it into the Product Key location and select Activate. If it work you should see this dialog.
The Product Key is stored on your PC and will allow the program to print without demo text.