Confused about instruction “autotrim”，if theAutotrim needs CH7 settings or repeats the steps of instruction.
Did you see this note?
For most users this procedure is not necessary because the accelerometer calibration does a good job of setting the trim values.
I consider Auto Trim a waste of time. Your thumbs are the Trim in Stabilize mode.
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I agree that Auto Trim is not normally required because the first step of the accelerometer calibration captures level. I never do AutoTrim any more for my vehicles.
And further to that, I find it useful to level the actual vehicle accurately across the plane of the props and hit the “Level Horizon” button in your GCS - rather than trying to level the actual flight controller before or during the construction phase.
where is the "level horizion"in MP,I can’t find it
Setup / Mandatory / Accel
and I mistakenly called it Level Horizon (which may be from PX4) and should have said Calibrate Level 
I pack the landing gear to achieve a very level frame, actually the props really, then hit that button, job done!
I know this,this function already has been used