A quick run through:
The Amuse app - Both in iOS and Android, download the app on App Store or Google Play and create your account by logging in through Facebook or Google. Confirm your real name (this is important as this is the person responsible for the tracks and will receive the payouts) and give us your artist name. Provide a phone number and email address so that we can contact you if we need to.
Cover Art - Min 3000x3000 px, not blurry or pixelated, no social media handles.
Music/Audio File - .wav-file or FLAC, sample rate at 44,1 kHz, stereo and 16bit
Dropbox - Download the free app Dropbox to store your music and cover art for easy access.