Uploading tracks is currently possible on two platforms: our desktop website and our desktop app.
Uploading to our desktop website:
First, go to http://audius.co/ from a desktop browser (laptop or computer)
Then, create an account https://audius.co/signup
Next, find the "Upload Track" button or go to https://audius.co/upload
You'll find a similar experience on the desktop apps as well.
We don't yet have support for mobile uploads.
Happy uploading and thanks for rocking with Audius!