I would like to have to enter a date of birth when registering But I found nothing in the user fields that could be used there

Have you tried the Discourse Cakeday plugin?

회원가입 시 생년월일을 입력하고 싶습니다

rishabh 8월 27, 2020, 10:16오전 2

Discourse Cakeday 플러그인을 사용해 보셨나요?