Why am i getting these errors from GitHub?

I followed these instruction and could not connect to github for the life of me.

>plink -ssh github.com
FATAL ERROR: Disconnected: No supported authentication methods available

plink -ssh git@github.com
You've successfully authenticated, but GitHub does not

with tortoisegit

git.exe push    "origin" master

ERROR: Permission to name/M开发者_运维百科yEmptyRepoOnGitHubHere denied to name.
fatal: The remote end hung up unexpectedly

Whats going on?

NOTE: I followed the instructions carefully. It was a lot worse before i followed them.

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I'm unsure if this was the solution was cloning first (the instructions say to push)and by using the url like git@github.com:NAME/REPO.git without skipping the git@

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More info here - Problem connecting to GitHub on Windows, even via PuTTY