How do I make bullet follow path of arrow sprite

I'm making an android version of my game. I want the player to fire bullets using the eight arrows on the lower left of the screen. Does anyone know how I can make the bullets go in the direction of the arrow once the arrow is pressed? Thanks.

https://www.dropbox.com/s/xd0wv5g9o7ycn ... .capx?dl=0

Have you tried to set the Bullet angle of motion for each arrow?