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需要：1，I-765 form; 2, a copy of I-94 or passport; 3, a copy of the last EAD; 4, a copy of 485 receipt.

-Correct.

5，还需要两张照片吗？

-Yes.

需要在背后签名吗？-Yes.

6，还有，需要打指模吗？如果需要，我应该去哪儿打呢？

-Probably USCIS may just use your old fingerprints for the EAD renewal and thus, you may not need to do it again. If they need it, they will send you the appointment notice which indicates where and when you need to it.