CommonApp申请提交后默认是不能进行修改的，申请人如要更新已提交信息，需要联系所申请的美国大学补充材料，不同的美国大学补充信息的方式不大一样，具体的申请人可以发email进行询问。
下面是CommonApp系统对更新已提交的申请信息的说明：
once an application has been submitted to an institution, you cannot make any changes to that application (just as if you had dropped it in the mail), and we are not permitted to make changes on your behalf. If you need to change information on a submitted application, you must contact the college's admission office directly to ask how they would like you to proceed.
还有CommonApp提供可以向不同的大学提交不同的信息，申请人可以通过创建不同的版本来时实现。
比如，突然发现UWM不用Form的 直接发邮件就好
How do I make changes to my application after it has been submitted?
Changes to your application may be sent via e-mail or U.S. mail to the admissions office of the campus. Do NOT submit another application.
