To bring up the registration panel, go to the Help menu, then select About SpaceMan 99. This brings up the About box. If you are running an unregistered version of SpaceMan 99, then this panel will have a Register button on it to bring up the registration dialog box.
When you order SpaceMan 99, you will be given a registration code. Once you have entered this code into the registration dialog box, your copy of SpaceMan 99 will be registered.
An unregistered copy of SpaceMan 99 will stop working after the 30-day trial has expired.