hello guise, sorry to barge in unannounced, I've been trying to install Nitdroid too and I've been following the steps given to tyger so far :P nevertheless I got stuck on the "opt" part too.

I do have the right file though, the error that pops up is the following:

cp: cannot create '/and/system/app/': path does not exist

so... should I create the folder or... ???? or what? :S