help locking user profile

Hi all,

I set up a wordpress blog ( http://adayonearth.org) where many people will use the same user account to blog.

I’d like to lock (of freeze) the user profile so that no one can change the common user account ( somebody already changed the profile during a test period to redirect to its own home page 🙁 )

I found a plugin called “Freeze users” that lock the password, but I’d need to lock other fields too ( mail, homepage, ….)

Thanks for your help