Change plan from professor to student

To be honest, a Student / Teacher edition is the same for both.  I don't think it matters much as long as you can establish your affiliation with an approved school or university i.e. school e-mail address or proof of enrollment.  You can usually do that by signing-in to your account portal at

https://account.adobe.com/plans

If you need more help, scroll down to Contact Adobe button on the same page.

This is a public forum, not the link to Adobe support
-other users here can't help with an account problem
Be sure to remain signed in with your Adobe ID before accessing the link below
-you must also allow 'cookies' in your web browser for this to work
https://helpx.adobe.com/contact/support.html