Did you start with this tutorial? https://www.scirra.com/tutorials/37/beg ... t-2/page-1
It is the best one to start with and will answer your question the best. It will also be much easier for people to help you if you start the tutorial and then ask specific questions about the tutorial if you come across something you just don't understand or can't get to work.
I am not dodging your question... it is just that there are a dozen ways to do what you ask... the easiest being give the enemy the bullet behavior with a speed value and run an event every tick that "sets its angle toward position" of player.x and player.y (if player sprite is named "player").