Positioning an actuator based on user input

Right now we are using time because the actuator does not send location information.

I can post our code a little later, i currently do not have access to it.

Hopefully this is allowed
http://www.princessauto.com/pal/en/Electric/12V-DC-2-in-Stroke--270-lb-Linear-Actuator/8507808.p

That is the actuator we ordered.
It is a Hydroworks 12V DC 2 in. Stroke 270 lb Linear Actuator

I appreciate any help
Thank you