How do I change the motor speed to 5 Hz 10 Hz 20 Hz?

[G-Apple1]

The version of lslidar I'm using is c16-xxxC, and in the ros2 code I don't see point_num or any other parameter about horizontal RPM in lslidar_c16.yaml. Link to the code I am using: git clone -b C16_V4.0 https://github.com/Lslidar/Lslidar_ROS2_driver.git