I'd recommend you go to the Haas website and download the mill control workbook (available in a pdf file). There is a section in there (page 70) on how to threadmill using simple commands.
It is better that you fully understand what is going on, because some tinkering is usually required to get exactly what you need to produce.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)