I dont have stats menu either and I dont recall it either.
Missions pop up as a button in top left with a person and exclamation mark.
Missions are tasks you can complete to earn Bux (or sometimes coins) in Tiny Tower. After the 5-year-anniversary update, missions appear randomly. When a mission is available, a blue square with an exclamation mark appears in the upper left of the screen.
from Tiny Tower wikia