When I change any file, the system will deny me access. What\'s going on? How do I properly set permissions on Mac?
Here's the solution: You probably tried to save the file to "Macintosh Hd" which is the default place when you click on "Save as", so you can't just save a file to the computer inside itself, you have got to choose a directory, like you can save it to /Desktop or /users/your_username/... something like that. But saving to "Macintosh Hd" will always be unsuccessful.