Changes can be made on the transaction detail screen after signing onto Escrow.com only when the status is waiting for you to agree.

If you are waiting for the other party to agree, only that party has access to the "modify" button. Once both parties have agreed to the terms, they must email their change requests to support@escrow.com. Changes after the terms have been agreed to must have the consent of both the Buyer and the Seller; and cannot supersede our general escrow instructions.