If you live in the United States of America, you will not be able to participate in the geo-beta for Club Penguin Island. Certain penguins there may have been lucky enough to get a closed beta invitation but others will need to wait until launch.
The Club Penguin team liked this tweet which means that the USA will need to wait until worldwide release. Don’t worry as the release date will be revealed this month! I would also be surprised to see other major countries such as those in the United Kingdom be able to participate.
I have posted a tutorial to download the game in any country which you might find useful though.