Login blocked now that .profile file has been edited for PATH...

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http://www.ubuntux.org – I wanted to add a new path, so edited the .profile text that is stored (hidden file) in my home directory. Since editing it and saving, logging out, I can't now log back in: my password is reognised but it takes me back to the log in. I just wish to change the .profile back to how it was originally, but to do this I need access to the home directory of my administratory account. How can I edit this? I can still log in as guest. I've a a bit of a play about in recovery mode, I can go into root, but I then can't find the .profile file which my edits in under /home. I've found similar threads but (Distributions)