In the song search, type in the song. When it's not there, click the blue label on the left that says "見つからない", and it will then take you to the request search. If what you're looking for still isn't there, press "まだない". It will then prompt you for the song you're looking for's JASRAC code, which can be found by searching here. The code you're looking for will look like this once you find the song. Enter it without hyphens, it will work fine. And then it's requested!
also believe me, that's not a newbie question at all, ahahaha. I had to do some research to figure it out.
That was incredibly helpful. Especially since I can't read Japanese. Lol. Thank you!