Not able to get wowza account number for sandbox

Hello,
As I am new to Wowza, I have just created an account and want API key for use Wowza cloud API for a live stream. for that when I am going to request for API page, I just redirect to form where I have to submit request for API and for that I need Wowza account number as I am new to Wowza I don’t have invoice detail so other than this from where I can find Wowza account number or how can I find API Key

You can test your REST API method calls using the sandbox environment for the Wowza Streaming Cloud. To obtain API keys for the production environment, you will need to have a paid Cloud subscription.

Michelle