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The parent who wants to modify (change) a parenting plan (“moving parent”) will have to file legal forms, including a “Petition for Modification of Adjustment of Child Custody Decree/Parenting Plan,” which identifies the desired change to the parenting plan and a "Summons," which informs the nonmoving parent about the court action and the need to respond.
Here's a link to the forms: http://www.courts.wa.gov/forms/?fa=forms.contribute&formid=32