Parenting Plan was done in HI,I now live in WA, how do i change custody

This is handled through the Uniform Child Custody Jurisdiction and Enforcement Act. Register the HA parenting plan in WA per the agreement with your ex. Once the HA plan is registered, it basically becomes a WA plan, and you can then file a motion or petition to modify the parenting plan in accordance with your agreement. Obviously, it is much easier to accomplish this with an attorney.