Game dont want turn on

i downloaded game and try play. I got this massage...

https://ibb.co/czKE3n

follow these steps:
1) Restart your PC
2) close your Torrent client and move your WoW folder away from your Torrent's download destination
3) now right click on WoW folder> Properties> remove "read-only".

what is last step remove ,,read-only" ?

http://i.imgur.com/5wWKUL6.gif