After you have received a registration code through e-mail, you can register Win2PDF by running
"Start->Programs->Win2PDF->Enter Win2PDF License". The following dialog will appear.
Click on the "Enter registration code" button, and enter your name, company, and registration code exactly as they are listed in your e-mail receipt.
If you entered the information correctly, you should see a success message as follows.
The PDF documents created by Win2PDF will no longer include the trailer page on each document.