Is there a website where I can find forms for this modification or do I have to go to the courthouse?
The forms required for filing of the motion are on the court's website. Go to:
However, the motion itself you would have to draft yourself, because obviously only you know the reasons behind the motion. Good luck! If you need help or a consultation, you should schedule a consultation with a lawyer.
I recommend you fill out the forms best you can but pay an attorney an hour or so worth of time to review them and write your motion. If they are done incorrectly, the other side will try to have the case dismissed. Then you will be right back where you started.
Good luck with you case.