How to jailbreak my ipod touch 3rd gen?

I believe I have the 3rd gen, i'm not sure. But i bought it maybe a little over a month ago.
i use jailbreakme.com
but everytime i slide the thing to jailbreak it either shuts off or just goes to my home screen and nothing happens. why is this?! and i googled my problem and it says something about the software you have? i don't know what i have ): please help <3
 
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