my dsi has parental controls put on by the previous owner, what do i do?

i got a used dsi xl at orbit dvd. it wasn't formatted, and there were parental controls left by the previous owner. here's what they blocked: ds download play, picochat, sending pictures to a friend's dsi, sending pictures via flipnote studio, and formatting the system memory. and the secret question was: "what is your mother's maiden name?" i can tell that they gave it to a younger kid. but i just want the parental controls off my dsi.