ilmoittaa itsensä johonkin
to sign up for, join to add one's name to the list of people who are participating in something, join an amateur team
to enter e.g. a competition, contest
to report to show up or appear at an appointed time; to present oneself
to register, check in, sign in, report (to the reception / receptionist, admissions office, or medical staff), say / give your name to the receptionist, fill in / complete your registration (form)