To initiate the process, you must file a petition with the circuit court in the county where the original order was entered. Our Elmhurst divorce lawyer helps clients file for a postdivorce modification when needing to make a change.Our St. Charles divorce lawyer helps clients who wish to make modifications to their divorce decree. There is no form for an amended petition. Just title it Amended Petition for Dissolution and prepare the same Petition you originally drafted. Illinois courts may view inheritance as a potential basis for a modification request. To learn how to fill out the forms and file them with the court, read the HOW TO GET A DIVORCE (WITH. Use this form to ask a judge to enforce or modify a divorce or custody judgment from another state. The petition may be submitted independently or as part of a divorce, separation, order of protection or parentage case. Our Bloomingdale, IL divorce decree modification attorney can discuss your options with you and petition for a decree modification.