Cannot "unlock" file... help

im trying overwrite old file new 1 ive been working on different hard drive , wont overwrite because says following; file attached

have tried unlock per instructions given "locked" section greyed out , wont let me change it. please.

 

attached files:

• 

  screen shot 2012-02-19 @ 10.49.18 1.png

  file size:

  21.6 kb

  views:

  67

you have click little "padlock" icon make changes:
mac os x - setting permissions

 

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