Wrong email address attached to account

Hello! I have problem accessing my school work on the eduspace.3ds.com webpage.
The only requirement to access the work is by logging in with my school email address. I've gotten an invite and used the invite with my school email address, but somehow my account is still attached to my personal email, and makes the school work unaccessible.

Is there any way to replace my personal email account with my school email account?

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