Refer to the image:

Which modffer can you use to ADD an event to a ruler $($such as a new Tempo change, Meter change, or Marker$)?$

SHIFT $($Mac or Windows$)$

REIURN $($Mac or Windows$)$

OPIION $($Mac$)$ or ALT $($Windows$)$

COMMAND $($Mac$)$ or CTRL$.($WindowS$)$

CONTROL $($Mac$)$ or START $($Windows$)$