Servo Connection and Setup Pixhawk 4

Hello, I’m a newbie here so bear with me here. I’m building a quadcopter and so far got the drone flying, I now like to add a servo to the Pixhawk to activate a drop mechanism. I’m using the Holybro Pixhawk 4 as my flight controller and a Flysky i6ab as my remote. I currently have an mg90s 9-gram servo.

How do I connect the servo to pixhawk 4 now