The Ship Registration Law Article 6

The registration shall be made jointly by the obligee and obligor entitled to the registration or whose proxy or proxies through an application to the competent authority. Any proxy making an application shall present the letter of authorization signed personally by the person delegating the authorization.
中文原文 船舶登記法第6條
登記應由登記權利人及登記義務人或其代理人,共同向主管機關申請之。
由代理人申請登記時,應提出本人簽名之授權書。

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