CREATE STATE (Q key): create a state on the mouse position.
SELECT TRANSITION / STATE: left-click on a state or transition.
MOVE STATE: hold left-click on a state and move the cursor.
CREATE TRANSITION (E key): once a state is selected, press E and select another state.
REMOVE TRANSITION / STATE (DEL key): once a state or transition is selected, press DEL to remove it.
RENAME STATE (R key): once a state is selected, press R to enter the renaming mode. In the renaming mode, press ENTER to set the state name.
SET FINAL STATE (F key): once a state is selected, press F to set it as a final state.
SET INITIAL STATE (S key): once a state is selected, press S to set it as the start state.