Make sure you have an active connection to the Internet so you can submit your registration online. The first time you run Click2PDF, the InstantX Registration dialog box appears. Select Help->About->InstantX button.
Enter in your customer information, and VIP key, and press 'OK' to submit your information over the Internet.
Your VIP Key looks like this:
PDFR-ABCEFG-LKJIH-MNO-UTSRQP
You can copy the entire VIP Key, including the dashes, and paste them into the first box on the registration screen to fully enter your VIP Key.