Since she wants to work as a subtitler in the series, she should not write to the Channel Manager, because the Channel Manager will probably not reply, or at most that she should write to the moderator in the appropriate language. So wait until the channel has a Channel Manager and the CM appoints an Italian or Korean moderator and then write to them.
If you have no experience as a subtitler, then you should introduce yourself here, perhaps someone from the relevant community will contact you and offer you support.