The followings are the way how to register a license key:
1. Open the About Panel from the Main Menu.
2. Input the email address that you used at the time of purchase and the license key in the text field marked red, as below.
The best way of putting the address and license key is Copy&Paste from the email you received.
Please don’t forget to type ENTER after pasting them.
When your License Key is valid, the following message is displayed according to your key kind.
'Your license key is valid.'
'Your license key will expire on Mar 1, 2009'
And the OK button is enabled.
3. Click the OK button to finish registering.