Problem attempting to push a commit

[aga]

What I've used for this in the past is
"ssh-add ~/.ssh/id_rsa && git push kde:kmymoney"

but I'm getting

"Identity added: /home/aga/.ssh/id_rsa (/home/aga/.ssh/id_rsa)

Permission denied (publickey).
fatal: Could not read from remote repository.
"

Please can anyone give a clue to what's wrong.

Thanks

Allan