set up a shooting button added the bullet to default animation make it spawn every 100 and change it from permanent to shooting try also single shooting.
@wesam_badr thanks for your reply. I want to shoot bullet once user tap on any area of the screen. I do not want to shoot bullet with specific button. Please let me know how do I achieve that?
Just scale the character shooting button (character button with function set to 'shoot') to cover the whole screen and make it transparent (Opacity 0).