Thanks for posting on the Community. You can follow these steps to upgrade your account to a free educational account:
1. Register for a free account with your educational email address.
2. You should automatically be upgraded to a free educational account.
If you see a banner at the top of your documents page indicating that you are on a free account, follow this link and click on the Request my Upgrade button. Once you submit the form, your request will be reviewed within 24-28 hours.