Not if you live in America, you can write in your vote for anyone you want. But it’s America so the two major parties each nominate one person and then most people choose between those two people and usually one becomes president. Donald Trump and Joe Biden are the current likely nominees from the two major parties. Some people do the write in thing and usually the person they write in is not elected president. It’s not a great system but that’s the one in America for the 2024 election.