From your dashboard, navigate to Tracks -> New Track
Enter the general information, like your Track Title, Genre, Tags.
On the Files Tab, upload your Untagged WAV file of the beat and it will be tagged, converted to MP3 automatically.
On the Pricing Tab, choose the Pricing options you would like to offer. If you choose an option that includes Stems, you will need to add it to the Files.
Navigate to the button list in the bottom-left corner of the track edit page. You can now click the CREATE button
As simple as that 😉