CMU-SCS submit 以后还可以改？

我已经submit了SCS的申请，现在也过了截止日期，按道理来说，是已经不能修改。。但是我看好像那些信息都还可以修改？我还试了一下新添加了一个推荐人，好像也可以？
是不是截止日期过了，如果你修改，那些修改的地方就不作数？

另外，SCS是不是没有submit键？我只是在application status那里看到我的状态是submitted。

应该是改了也没用了,以下内容摘自官网
You may return to this web site to track the marked receipt of your uploaded supporting documents, such as test scores, transcripts, and letters of recommendation. You may also make changes to your submitted application until the final deadline of December 15th. Absolutely no changes will be allowed after this date.