Hello,
If you were looking to sign up with Azure for Students, this is not wrong. If you were looking for student benefits, then this was the correct process:
https://azure.microsoft.com/en-us/free/students
If you are looking to sign up for Azure Free then you should be using:
https://azure.microsoft.com/en-ca/free/free-account-faq
You cannot separate the two, you will need to sign up with a completely separate account. You may need to reach out to sales to see if you qualify for Azure Free now that you have taken advantage of Azure for Students.
If this is helpful please accept answer.