Apple
Visit the following link https://artists.apple.com/
Click "Sign Up" and type in your Apple ID email and password, or create one if you do not have one already
Click on the "+" button to attach an artist page to your account and type in your artist's name.
Fill out the form, and you can paste the following information in for your Label Contact...
Company: Stem Disintermedia
Contact Name: Stem Support
Email Address: [email protected]
Spotify
Go to this link: https://artists.spotify.com/c/access/artist
Click on "Manager"
Paste your artist's Spotify page link into the field
Log into Spotify or create a Spotify account to request access
Amazon
Go to this link: https://artists.amazon.com/select
Click on "Get Started"
Log into your Amazon or create an Amazon account to request access
Select your artist name and complete the fields
Deezer