Deleting and reinstalling kodi on MI box

Soooooo. Im thinking that i downloaded a bad source. Or that s what im hearing from people replying to my threads. This is not the route i want to go down.
I was shown where to install kodi from the wiki page. But to get rid of the old version do i just delete it, or is there something else i need to do.
I guess youtube isnt that great for this