I typed ssh git@gitbash.com in the gitbash and it said ssh: connect to host gitbash.com port 22: Bad file number.
So I tried ssh git@github.com, then it said Hi verde12! You've successfully authenticated, but Github does not shell access. Connection to github.com closed.
If you are following the guide on the wiki, then you are doing everything right. That step is only to make sure you have your keys set up right on your github account, so if it knows who you are, you did it right, just continue.