NEED HELP WITH EXCEL LIST

OK I HAVE MY LIST IN EXCEL - AND I WANT TO INSERT ANOTHER COLUMN AND NUMBER EVERYONE SO I CAN GIVE THEM THEIR MAGIC HIDDEN NUMBER ON THE BACK OF THE RSVP CARD - I JUST DONT FEEL LIKE TYPING 1-140
IS THERE A WAY TO JUST NUMBER THE LIST AUTOMATICALLY? I KNOW THERE IS A WAY I JUST CANT FIGURE IT OUT

TIA

NEVER MIND I FIGURED SOMETHING OUT
PUT LETS SAY A9+1 AND DRAG IT DOWN


DUHHHHHH!

that's what i was going to suggest