Internally there is a jumper you change/move and a fuse ditto…
IF you dont know how to do this just bring it to a electronics shop or service place and They should be stable to help. IF this sound like Get it Right or stuff go boom, dont attempt it yourself. Pretty please…
But its that simple…
Good luck
Or IF its the Mk 1 you have. Like for 100 bucks you can Get a 230/115 V transformer. That also is possible.. but I think its a fuse/jumper move..