Not really an efficient way to use the Heidenhain. But this may help
In the manual window you will see on the left x y z m s down the side next to the softkeys you may have to scroll up and down to see them all
I guess you know how to Home (traverse reference points) and reset shot bolt to start the machine up??
to start the spindle enter a speed in with the S button
then press m and 3
Cycle start button
This is from memory I'm a bit rusty
Find the manual if you can it's all in there.... you are looking for the MDI modes