Do not know how to, but did you try the Forum Search, there are some threads where this was discussed before. Will may be faster than waiting on an answer.
The wiki claims to uninstall and remove the nitdroid folders and files using filebox. This messed my system up beyond repair, however Im clearly to blame as others have followed the wiki countless times without trouble.
Code:
root
mount /dev/mmcblk1p2 /and -o noatime
nitdroid-uninstaller
cd /
umount /and
if you want to remove installer
here the code:
apt-get remove nitdroid-installer
goodluck