Converting space shooter to mobile

As the live training session here

i successfully converted my game to mobile which is similar to space shooter

but i had one issue when holding down your finger on the “Fire zone” which includes the

“SimpleTouchAreaButton” there is continuous shooting from the ship it self,what i want is only

when the player taps that area the shot to be instantiated and when held down to only shoot once

like the tap and stop [No continuous shooting],how do i do that?

Only instantiate a bullet if the phase of the touch is TouchPhase.Began. Unity - Scripting API: TouchPhase