The lumbar support lever is on the right side of the seat...feel right above the center console...you'll find it.
The round button above the license plate recess is lock/unlock, not "flash the lights" LOL.
Hey, it's a sports car...it behaves and sounds like one...rough and gutteral...much more akin to a Z4 M coupe than a 3 or 5 series BMW.
Congrats on the new car!