Xiaobaitu, Please.

I'll file FOIA form with FBI, but I have no idea about the following items on the FOIA form.

On the FOIA Form,

Q 1: Enter maximum amount you are willing to pay: $
Q 2: Explanation for a request for a waiver of fees:

Do I/we need to pay some amount of dollar, how much?
How to request for a waiver?
If we do not need any fees, how to fill out these two blanks?
I have never heard of people paying fees on filing FOIA form.

Thanks.