please i neeeeeeed help

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http://forum.xda-developers.com – i try to connect a usb flash memory to my tab 2 and i follow a trick i get female-to-female usb adapter and connected it to the galaxy tab 2 usb adapter (that comes with it in the box) then connect to it a usb flash memory , but my tab didn't read any thing so after searching,using my avometer and making tests between my tab and my lab i concluded that: -the female-to-female usb adapter is working probably -there is no 5v output on the usb male adapter so i think because that the terminal device can't be read please help me, any one can explain that? is the manufacture close that prop (HowTos)