HOW TO RECORD FROM YOUTUBE STRAIGHT INTO ADOBE AUDITION

It depends... on a lot of things. Firstly whether this is a Mac or a PC. If it's a PC and you have a 'what you hear' selection available as a recording source, then use that. That doesn't always work though because some manufacturers deliberately remove this option, citing the RIAA and copyright law. Others leave it available, so it's a bit of a lottery. If you can't find that, there's something called Virtual Audio Cable that you can set up to provide a direct link between your browser output and a recordable input - but it's an almighty pain to set up, and a lot of people simply give up trying.

The option I use is a separate app that effectively does what Virtual Audio Cable does, without you having to go through the whole rigmarole of setting it up, and that's NCH's SoundTap. It just works (it tells you exactly what it's up to all the time), and does all the recording too. I have no affiliation with NCH Software at all, incidentally, other than as a satisfied customer.