Use the manual.
So down and dirty, pitch curve is 0 25 50 75 100.
Throttle is tricky. It depends on which mode you use. I personally suggest gov sto mode. After you set that then unplug and plug in the esc. With the throttle stick at 50% let the heli spool up and sit there for 30 seconds or so. Cut the throttle or hit throttle hold. Unplug and replug in battery and your done.
Your throttle curve will be 60 60 60 60 60, 70 70 70 70 70, 80 80 80 80 80,.... Pick any 2 variations you want and set them to iu 1 and 2. Now your throttle curve number will correlate to a head speed. You may need to tach your head to get that number. A dx6i does not ha e telemetry. So getting your head speed on the radio may not happen.