First of all click Sign Up on the main page:

You can create an A-ADS account in different ways:
By email — enter your email, solve reCAPTCHA, click Sign Up, follow the email confirmation instructions
By access code — download your access code, solve reCAPTCHA, click Sign Up
By one of the following social networks: Facebook, Google or Twitter — choose one of them and sign in

We recommend you create an account using email: it's necessary for security notifications and password recovery

If you create an ad unit or a campaign — your account is created automatically. In this case do not forget to save an access code, otherwise you won't be able to access your account.
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