My macbook air can't share internet

i don't know why my macbook air can't share internet to my iphone5 or any other phone even when its connected to internet

Hi riteah,
Welcome to the Apple Support Communities!
Internet sharing is something that you can do with your MacBook Air. Please read over and use the following article as a resource. If you have tried these steps and are getting an alert or failure, please respond with the alert that you are receiving.
OS X Mavericks: Share your Internet connection
http://support.apple.com/kb/PH13855
Have a great day,
Joe

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