GitHub: Permission denied (publickey). 問題解決方法

以前一直用https來push到github上, 今天試了下用ssh, 把origin改成ssh地址後, 用git push -u origin master出現錯誤:git Permission denied (publickey). fatal: The remote end hung up unexpectedly 上網搜了一下, 緣由是' You've probably not added

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