The fees are different for each kind of case
There is no filing fee if you ask the court to change a temporary order.
The filing fee is $50 if you ask the court to change a judgment concerning child support, custody, or visitation.
What if I cannot afford the fees?
If both you and the person you are making an agreement with:
(A) are on public assistance,
(B) have an income after taxes of less than 125% of the poverty level, or
(C) paying the fees would make it so that you could not pay for your basic necessities
you can ask the court not to make you pay filing fees.
Use the Affidavit of Indigency form. Each of you must fill out your own form.
If (C) is the reason you cannot afford the fees, you must also file a Supplement to the Affidavit of Indigency.
The court has Instructions for filling out these forms.