Can't transfer my new email account from yahoo to iCloud; it keeps saying "this email is taken". YES, it is mine. I receive 0ver 200 junk mail on yahoo and maybe 2 on iCloud. Can you please help me?

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I'm Barbara @ sundancebird@icloud.com    I receive all my seeking alpha mail bia sundancebird@yahoo.com   How can I change?  I've tried for three months and they won't let me.