How do I post my music on Apple Music?

You need to create an Artist account: https://artists.apple.com/support/

You may also need to select a partner distributor to get your songs onto Apple Music.

https://artists.apple.com/release

Hello Big Gunshot,

Artists cannot directly post music on Apple Music. You can sign up with a distributor (such as TuneCore) that will handle the legal and commercial arrangements with Apple.