Samsung Apps generally isn't available in the American versions of android devices. If you have an international version, it should come with Samsung Apps, and you should be able to create an account. But if for some reason, your samsung account password is associated with an american Galaxy phone you've purchased before, you will need to log out and re-create another samsung apps account using your galaxy note 2. The registration requires that you meet the registration requirements of the country where the phone originated. I don't think the UK or China has any crazy restrictions so it should be ok, but if you happen to have bought a korean galaxy note 2, you have to register for a Korean account, and since you don't have a Korean ID number, you will not be able to register. thus, you cannot use samsung apps.
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Check out my huge collection of 64GB Samsung Galaxy Note 2 Videos (Demos, Accessory Reviews)