How do you access the file managerIts easier to add additional sources (including navi-x) this way
in XBMC go to file manager, and Add Source (you need to hold two fingers over Add Source so the new window pops up
Add this repo
Name it sinful, or whatever you want, back out of it.
Then go to System, then Add-ons then install from zip file, and open the "sinful" link you added previous, you can then install 1channel, Icefilms, Sports Devil, Video Devil, anything you want.
Once installed via zip go to Get Add-ons then All Addons and just install what you want.
Then in Videos go to Add-ons and all your channels and repos will be there.
if that doesnt make sense google "fusion XBMC" it'll explain with pictures