The short answer to that task is “No, you cannot do that”. And following is the long answer and how I did it a couple of days ago in a trip to US. (See also the Update 1 below)
You cannot register your Kindle 2 (click Settings in Home / Menu) outside US, as it works only wirelessly with Sprint network in US. And even you can hack your Kindle to connect to Internet (without the Sprint network), the built-in GPS in Kindle 2 will reject the registration. In other words, you need to fly to US or ask your friend to take your lovely Kindle 2 to US to do it for you.
But still, without registering your Kindle 2, you still can buy eBooks and read those without any problems.
Anyway, I did register mine in a recent trip to US, and here are the details. I arrived San Francisco airport and I took out my Kindle 2, switched it on, turned on the Whispernet and tried to register.
Surprisingly, the device registered itself (I thought I needed to enter the Amazon membership information). And my Kindle also downloaded the previous sample reading, downloaded Jeff Bezos welcome letter and even whispersync my other book I was reading with my Kindle for iPhone. Freaking brilliant.
Then I started the Kindle shop from within the Kindle 2, searched the book I want (Quiet Strength), clicked Go and bought a book. Within a minute, my Kindle 2 homepage shows the new book. It’s that easy. The only thing I thought it could improve was it should have indicated that the book has been downloaded – as just from the name in the homepage, I could not tell (from user experience point of view) whether the Kindle was downloading a book, or already finished the download. Anyway, I browsed the new book a bit and confirmed all chapters were there.
So, my Kindle 2 is kinda completed all the basics, the next frontier is to hack the Kindle 2. Stay tuned.
Update 1 : If you really want to register your email address, Kindle name etc. to your Kindle – without Whispernet, here is a trick … create a reginfo file and copy it to your Kindle (for expert only though …. I warn you here).