M6 is a tool change (on most (all?) machines).
What you likely want is an M0. This is a stop requiring you to press the start button again. The way to get that into your program is as follows:
Click on your Setup once.
Right Click.
New Operation
Scroll down to the bottom: Manual NC
Clicking on Manual NC will open up a new dialog box where you can select a whole crapload of options. Most of them will not work, as they require post configurations. M0 should work just fine. Chances are it will insert it at the end of the file, so just grab it and drag it wherever you want
be warned though: All this will do is stop the machine. If your machine is setup to turn off spindle and coolant, you will need to manually enter those codes into your program. This in of itself isn't that much of a task, although it does get annoying. If you find yourself doing this often, you may inquire about getting your post edited to re-output the M3 and M8 after an M0
Seth Madore
Owner, Liberty Machine, Inc.
Good. Fast. Cheap. Pick two.