Code of Civil Procedure Article 439

A party may waive the right to appeal from a judgment entered in the first instance after such judgment is announced, published, or served.Waiver of the right to appeal from the judgment made orally by the party upon the announcement of the judgment shall be indicated in the oral-argument transcript, and in case the opposing party is not present, such transcript shall be served on the opposing party.
中文原文 民事訴訟法第439條
當事人於第一審判決宣示、公告或送達後,得捨棄上訴權。
當事人於宣示判決時,以言詞捨棄上訴權者,應記載於言詞辯論筆錄;如他造不在場,應將筆錄送達。

English translation for reference only; the Chinese text prevails. Not legal advice.