How do I get a product I purchased over the Internet changed over to CPAP mode instead of APAP mode (vice versa)?

The Z1 or Z2 should have been set to the specific pressure(s) stated on your prescription. You will need to call smallCPAP.com at 855-436-8729 to discuss this further, as we hold your prescription. If you prefer to bring your Z2 to your local doctor or licensed therapist, we can email them the Clinicians Manual with the instructions to set your device.