Problem with logging in as a student without an e-mail address

[hmk3528]

Any e-mail addresses didn't need to be filled when I signed up as a student on Canvas from my instructor's link. But I realized I have missed something since it is automatically logged out before setting. Once I had been logged out, I couldn't log in anymore because E-mail address was anyhow required when I wanted to log in again. 

Please help

Thanks

Mk Hong