How to make player shoot by touching a shoot icon image in unity.

Sorry for my bad english. I’m making a shooting game for android and i have this image of shooting sign in lower right side of screen , I want my player to shoot when that image is tapped , how to do it ? . Also give me any link of tutorial related to question. Thanks

This is everything you need: UI Events - Make buttons do something - Unity 4.6 Tutorial - YouTube
This tutorial shows you how to make buttons. Button will respond on touch inputs.
Then you just have to add a method to shoot and everything should work