If you bought from Mobipocket.com, go to your bookshelf at the web site and click on "my device list". It should include your desktop computer and its PID (on the reader, click the "?" icon and then "about" to get the PID). The process is similar at other stores (e.g. fictionwise is "my bookshelf" -> "update my profile" -> "Secure Mobipocket Personal ID").
It has been a long time since I originally registered, but, like HarryT, I think I did this via a web browser rather than within the reader. There should be no difference at the web site end, providing it identifies the right account.
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