Okay, assuming nitdroid kernel is in MyDocs: Code: root mount /home /and dpkg -i /home/user/MyDocs/NITDroid-kernel-Mido.Fayad.deb Then do NOTHING, just turn off your N900, and turn it on again, and choose Nitdroid.
root mount /home /and dpkg -i /home/user/MyDocs/NITDroid-kernel-Mido.Fayad.deb