The current portal, located at https://manage.windowsazure.com, is accessible with a valid credential, a Microsoft account, or a company account (hosted on Azure Active Directory). For users who do not have a valid subscription, the steps to get it are:
Obtain a valid Microsoft account (or create it at https://signup.live.com).
Click on add subscription.
Choose the appropriate subscription (as shown in the following figure):
Verify the account (with a valid identification method; it depends on the subscription) and confirm it.
Go to the Azure Portal ( refer to https://manage.windowsazure.com).
Once we are in the Azure Portal, the new subscription is added to the default directory of the owner's account (if any) or to an auto-generated one, if it was the first subscription or the user has not yet created a custom directory.