How to control yaw in stick aircraft?
There are a few ways that yaw control is achieved.


The easiest and the first to be successfully used would be to have cables from rudder pedals on each side of the rudder to deflect the control surface and control yaw.



Airplane Flying Handbook pg 2-1


The first application to control yaw unsuccessfully was the development of gears and linkages that will control both roll and yaw with the pilot stick.  It was quickly discovered that there are cases where you may need to use the controls separately.
Yaw damper is an electronic device that sense yaw rate and will provide inputs to the rudder to keep the airplane coordinated.




https://www.gulfcoastavionics.com/images/products/3552/detail/detail.jpg