陶瓷信老师这么回复，我应该怎么做？

给老师发了陶瓷信，说明想进他的实验室读PHD，回复如下：
Thanks for your interest - please formally apply to Drexel and indicate in your essay specifically how your research aligns with the work described on my lab web page.

Drexel的申请截止日期是June 13th. 截止日期很晚，我接下来应该怎么做？