The saw probably needs it own circuit anyhow. Do you happen to have a 120v
20a circuit that isn't otherwise used? If so, then you can change the saw
to 120v and be good to go. There is probably a wiring diagram on or in the
motor.

If not, then you should add a new circuit. Assuming you have space in your
breaker box, it would make more sense and be just as easy to add a 240v
circuit. (240v requires two breakers)

And while it is very easy to do (run the cable, put a breaker in, attach the
cable to the breaker, attach the other end to your new outlet) if you have
to ask how to do it, you probably should have someone who doesn't have to
ask do it. You can do 90% of the work by running the cable from where the
outlet will be to the breaker box.