Cannot rewrite hard disk

HI, I cannot seem to rewrite my external hard disk. Under General info, there isn't a "locked" box which I could tick. The sharing & permissions states that I could only read.
What can I do to unlock it?
Thanks.

How is it formatted? OS X can read, but not write to an NTSF formatted drive.
Sharing drives | Utilities - Page 1 | Macworld

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