How to control actuator speed and direction using potentiometer

here is the data sheet
http://www.warnerelectric-eu.com/pdf/catalogs/warner/electric_linear_actuators_and_controls_full_en.pdf
its a b track.
last time I posted this I didn't get information. and yes im new to programing also.
this might be easy for some people but not for me im more of a mechanical guy. I know how a potentiometer works and I know how this actuator works, I read so much.... however I still don't know what I need to buy? or whats the code that I need? and how I would hook up potentiometer to this actuators. or what other components I would need
please if you can help me send me what I need to do.

thank you again