If you really want to know how to change/access your settings on a ResMed S8 AutoSet II or an S8 Elite then you can find the instructions on the Change CPAP Pressure Settings page at apneaboard.com. However, I recommend that you first read my comments on this in my Living with a CPAP (Obstructive Sleep Apnea Treatment) page.
A couple of weeks ago I started tracking how I felt after a night of sleep using a calendar. I’ve since graduated to maintaining an Excel spreadsheet that logs this information using a scale of zero to five (zero = severe fatigue, five = well rested). A couple of days ago I started checking the morning’s effectiveness stats and recording that in the same spreadsheet.