This can't be exchanged now. If it matters, say it separately. If it doesn't matter, you can only tell your counselor that you don't want to study this major at the beginning of your sophomore year, and see if he can help you change your major, but it must also be that there are classes in your major that are willing to accept you, usually. But after you change your major, you have to start from freshman year, which is equivalent to repeating one year. The rest won't have any effect.