How to format an external hard drive in el capitan

How to format an external hard drive in el capitan?

I have a new iMac and bought a WD 2 TB hard drive. The manual says that I have to reformat the hard disk to use it with OS X.

I opened the disk utility program, but there is no button to format the hard drive.

How can I manage to reformat the hard drive?

Select the external drive, and then click clear. Format Mac OS Extended journaled. If you want the drive to be bootable partition with the Guid partition scheme.

Tags: Mac

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