The Logic Off Topic list

I'm sure this is something to do with 'permissions' etc. I am not an 
expert on this new OSX feature and I want to rename some audio files 
but the OS won't let me.
I opened the 'get info' box and changed all three boxes from 'read 
only' to 'read and write' but it's still not letting me.
Where do I learn about this stuff? An OSX book? Can someone help me get 
this happening?
Cheers.
Roman.