[chmod]

I doubt you really searched.
First 2 links from Google:
http://www.youtube.com/watch?v=2upq7Ks3tBY
http://www.youtube.com/watch?v=BhgcLkRdvtQ

bad quality i cant read the commands

can you help me with that ?

Try watching it on fullscreen on a resolution higher than 144p (both these videos are available in 1080p) I can read all the commands perfectly well even from a mobile phone. Stop being lazy and help yourself a little instead of expecting to be spoonfed
/closed