@ JP 1000- I don't think you can do that... sorry. Once you've submitted your app, you've submitted it for good. However, I don't think it will hurt your app too much. They might wonder for a second, "can this kid follow instructions?"... but, if your essay is good and the rest of your app is what they are looking for, I definitely do not think that 2 pgs double spaced will be an application killer by any means!!
Good luck!!!!