How to set it, My book to go in standby mode

Hi
I purchased an external hard drive My book model WDBFJK0030HBK-EESN. I would like to ask some help, because I don’t know how to set it, so the drive to go in standby mode when I don’t acces a period of time only the other drives in pc.

Hello, you can setup the sleep timer form the WD Utilities app. Check page 55 of the manual for more information. 

http://www.wdc.com/wdproducts/library/UM/ENG/4779-705106.pdf#page=60

WD Drive Utilities for Windows

http://support.wd.com/product/download.asp?groupid=132&sid=171&lang=en

  Hi

Thank you for help,I found this posibility in my soft WD drive utilities before, but I have my
windows in hungarian language and here is an translating error in the soft.
Here not appears  sleep timer, appears just timer,and in setting wrote: setting the time for drive on,
not off.
Now I know how can set the sleep mode ,and thanks again for help.
I attach a picture document about this error.