Why can't I sign in to my Kobo account on the Kobo Arc?

Can't sign in to my Kobo account does not reconise me and need to reset the account and start again? My present, past email address told are not valid, will not let me set up an account on my computer for my Kobo Arc, how does this get sorted.

I think you are entering a wrong password. Please try again and enter account name and password slowly and carefully.

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