A divorce agreement modification can make the changes necessary to the original decree, and adjust to your new state of affairs. Attempting to modify your divorce?You'll need an experienced and supportive divorce attorney to help. If you are not happy with a divorce agreement, you can ask to have it modified. Has your life changed in such a way that you wish you could modify your child custody, child support or spousal support agreement? To request an alimony modification, a party must file a motion to modify or terminate alimony with their local county court clerk. The parties can sign a written Marital Settlement Agreement, which the Judge can adopt Order of Court. Box 1: Print the county in which you are filing your petition. See "Where do I. File?" in the Introduction for more information about what county you. Applying For A Custody Modification.