text: I believe you can not cancel a duplicate yahoo e-mail account because I don't believe you can make a duplicate e-mail account or account. I believe you can, on the other hand, make a new one and leave the old one, or possible delete an old one and make a new one, or maybe you can change an old one by the account settings. You want a different e-mail account, so I suggest just make a new one, and if it states you already have an with them and you cant have another, see if you could delete it or change it. It that doesn't work, just find another site where you can also do for free if you want.