How do I change/revoke a temporary custody agreement?

You can file an Order to Show Cause (court form) with the court requesting a modification of child custody.  With the Order to Show Cause, file a supporting declaration signed under penalty of perjury.  The supporting declaration states the facts in support of your request for a modification of child custody.  When you file an Order to Show Cause, the court will schedule a hearing on the issue of modification of child custody.  In addition to the Order to Show Cause and supporting declaration, file a proof of service and serve a copy by mail on your ex of the documents you have filed with the court.  The proof of service verifies the date of mailing to your ex.  You can either use a court form proof of service or you can write your own.  If you write your own proof of service, it just says that you are at least eighteen years old and the attached documents were sent via first class mail unless stated otherwise to __________ (name and address of your ex) on _________ (date).  You sign and date at the bottom.  The date you sign should be the same as the date of mailing and the same date you file your documents with the court.

Check with the court clerk before filing your documents with the court to inquire if any additional documents are required as the required documents for your request for modification of child support may vary from state to state.