You mean NITOtv I assume... I don't know what nitro TV is
Easiest way is through the USB PATCHSTICK.
I googled NITO TV ATV1 and found hundreds of links. Here is the top result, and still easiest method.
http://wiki.xbmc.org/index.php?title=HOW-TO:Install_XBMC_on_Apple_TV_1
That said... For get that nonsense and just install openELEC... no need for nito TV

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Yes it is Nitotv... i just wrote it wrong, thanks for the link but i have already jailbroke my atv1 with that patchstick. but it didn't come with nitotv on that patchstick? the reason why i what nitotv is to be able to enable the USB wireless keyboard and mouse feature...