"She does not want to register."
Translation:Cô ấy không muốn đăng ký.
Is it included other meaning >>> check in/ enrolment / login? Would you please give me some examples to this word.
Đăng ký means to register or enroll into something.
Đăng ký tài khoản mới = to register (a) new account.
Đăng ký lớp học = to enroll into classes
Checking in as in to check into a hotel would be "nhận phòng".