关于deposit占坑费的问题

由于占坑费deadline较早，我已经交了，但是还有一个final step要签字，然后说
This is the final step in enrollment submission process. No changes to your enrollment through the online system are allowed once you enter your digital signature and click on the "submit" button below.

请问我签字之后还能decline吗？因为还有学校的没消息，所以可能会变动。