Well, that manual didn't help, But, I took my machine in for a check-up, and asked my great repairman. If anyone else has that machine and wants to know, the needle positioner is on the stitch width dial: to the far right is middle, to the far left is left. There are tiny icons to indicate. No right position.
the feed drop lever is behind the piece one removes to sew cuffs, etc.
Everything else is so nicely labeled, I don't know why they hid those two functions so well.