In general, Texas has very few official legal forms. This is why you will not always find a free fill-in-the-blank form for your situation.File an "amended petition" to add something to, or withdraw something from, the original petition. Have an attorney look over your amended petition. Step 6: Fill out the Final Decree of Divorce and other ending forms. Fill out this Final Decree of Divorce form: Final Decree of Divorce (Set B) These instructions explain the basic steps in a default divorce when there is already a final court order for custody and support of your children already in. A court with continuing, exclusive jurisdiction may modify an order that provides for the conservatorship, support, or possession of and access to a child. To modify a divorce decree in Texas, you must demonstrate a material and substantial change in circumstances. The facts stated in this affidavit are within my personal knowledge and are true and correct.