How do you format a WD External drive 3 TB using Mac OS Lion 10.7.2

Hi ,
I bought a WD External drive 3TB , mac sees the external but cannot make use of it. I have tried partioning it , but it will not allow me to.
Any help to format to make it compatible ?
Thanks

Do you select the drive and not the partition when you use disk utility?
What is in blue is the drive, below are the existing partitions. With the drive selected, the partition tab should allow you repartition the drive and select each volumes type, ...

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