Put the indicator on and then place light pressure on the wheel in the same direction. ...
Well, I've tried.
Sometimes when I put the indicator on, it indeed colours the lane next to me blue and has a white-ish rounded rectangle showing where my car should end up. Sometimes it doesn't. Dunno why. When it doesn't, turning the wheel always drops me out of Autopilot (AP). When the animation shows up, out on clear open freeways, it often manages to change lanes without disengaging AP. Sometimes with the blue-lane animation it's just too slow to actually do anything and I get dropped out of AP as I turn the wheel because I do actually need to change lanes.
But on NoAP, sheesh. It sometimes puts on the indicator completely inappropriately. I must have confused the heck out of surrounding traffic this week, with the car indicating nonsense (like when entering a freeway from the left it'll indicate left, huh, who does that?). When it decides it wants to change lanes and shows a blue neighbouring lane on the screen, pushing the indicator stalk to the "full", or second, position starts the lane change, no wheel input required. But, most of the time, it fails. Sometimes it starts moving, then bails out and stays in the current lane, only to start indicating again a second later. Often when I need to change lanes I have to indicate and manually tug the thing out of AP with all the grace of a wallowing pig because the blue lane doesn't show up.
I turned off speed based lane changes because the car frequently has wrong speed limits (believes 100 when it's 80) and seems to suggest lane changes when we're all doing the speed limit.
And a final annoyance is that when the car puts the indicator on, pushing the stalk in the same direction, as I've become used to doing with this dumb "state-less" indicator stalk to cancel the indicator, no longer cancels the indicator.
Can't say I'll miss this inconsistent behaviour when the trial expires. Fun to try for a bit but ultimately more frustration than it's worth, in the places I drive.
Better luck to the rest of you.