For Korean, Japenese, Chinese to English translations, since these source languages are important for other languages, it’s another reasoning I would say?
You can message the Chief editor or the English subbers recruiter to ask to participate (you see under reviews of a drama page, there’s a colorful picture with people contacts, “we recruit.” It’s eye catching normally, you will probably find it)
Look for +++ currently on-air shows and ++ coming soon. Shows where the English subtitles are being currently done or are not available yet.
It’s on the main page of the website.
Good luck!!