<p>If you don't have a pin go to <a href="https://admissions.cornell.edu/selfservice/getpinid.cfm%5B/url%5D">https://admissions.cornell.edu/selfservice/getpinid.cfm</a>, and type in your email that you put on your application. You should get an email: a letter that you're supposed to receive by mail with your pin number.</p>