I am following the 4-step tutorial at ModMyiPhone and managed to get to almost the end. I just uploaded Unlock.app to my iPhone. Then it says in order for it to work I must change the file permissions of Unlock.app, and I have to "ssh into my phone". This followed by

cd /Applications

chmod -R 0777 Unlock.app

which I assume is what I have to do to ssh? This must be a stupid question but I have no idea how to ssh? Can anyone help? I'm sooo close!!