Hi
Ok no problem, all you need to do is navigate to
HDROOT/Users/yourusername
Now, in there is a .ssh directory, usually its hidden so do the following to show the hidden files for now.
http://www.macupdate.com/info.php/id/26729/houdiniThat little app sould show you hidden files and folders, if it doesnt work run the following in terminal
defaults write com.apple.finder AppleShowAllFiles TRUE
killall Finder
To reverse replace TRUE with FALSE, finder will crash but restart automatically with hidden files shown.
Once your in the .ssh directory you should see the files that you need to add to in order to get your key working!
Regards
Paul