I guess this is more of a Mac help topic - but still - you asked for it:
Mark the file (click once on it) press command (apple button) + i (for info) the modify the security settings for the file.
OKAY i have a BIG problem! i did what you said to do in the instructions but then when i did it, now everything is in caps and it says things like AWAY_LOCK... i need help im a bit of a n00b so help me!