There is a Turret Defense template built into Construct that can show you everything you need to know about creating a game using turrets. Just create a new project and search for it in the list.
There are 2 actions on a sprite that you can use. "Set angle toward position" or "Rotate toward position", then use the X and Y values from the player object in the position fields of the action. Of course any of the rotate functions would work but these 2 are the easiest for what you need.
I hope this helps and good luck with your project.