Social Worker Act Article 9

A social worker who wants to engage in the profession shall send the social worker certification to the competent authority of the municipality or county (city) where he/she is located, apply for registration, and then start to engage in the profession after being granted a business license.
中文原文 社會工作師法第9條
社會工作師執業,應向所在地直轄市或縣(市)主管機關送驗社會工作師證書申請登記,發給執業執照始得為之。

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