プルリクエストの方法は？

[akapy]

fdclone-3.01j.ebuild　を書いてみたのでプルリクエストを試みたのですが。。
どこかにやり方が書いてあります？

git push origin testakapy
Enter passphrase for key '/home/akapy/.ssh/github_id_rsa':
ERROR: Permission to gentoojp/gentoojp-overlay.git denied to akapy.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.