I forgot my Apple ID password

Hello,

I forgot my Apple ID password for my Email. Each time I want to reset it, the browser tells me ‚the email is no ID‘. Because of that I can‘t reset my password, and I don‘t know my Email and the password for my ID.

The problem pops up, when I want to logout from iCloud.

What shall I do?

Product: iPod touch 5

Thank you!