Jim--here's a direct link to the page that gives you instructions for changing the settings directly on the machine. Just click on it --
The video posted there gets into the Clinician's Menu stuff at around 11:30, if you want to skip past the simple stuff.
Once you get into the settings menu, make sure the machine mode is on AutoSet. Personally, I would turn the Ramp off during the initial stage of finding the right settings. If you want Ramp, you can add it later. I'd also set the EPR at the max for starters, which would be 3. Again, you can change that later when you get into the fine tuning.
Up above, Shastzi suggested you start out with max and min of 11 and 7. But since this is an auto-titrating machine, it's going to deliver the minimum pressure needed to get effective therapy. So I'm a proponent of using a wide range of max and min at the git-go, then later after analyzing your SleepyHead stats, you can dial in the max and min to a tighter range.
(For me, even after 10 years, my IPAP pressure can vary from 8 to 18 during different sleep periods all on the same night! So you can see why I think wide ranges are good.)
About the SleepyHead crashes, I'd suggest you start a new thread in the Software section of the forum with info about your computer and operating system, so the software geeks can have a go at it. It might be something as simple as reformatting your SD card (though you'll want to save the contents of the SD card to some other location first, because reformatting erases everything!) or updating the SleepyHead app.