Publishing your first audio is very simple and easy:
Tap on the central button of your navigation menu. The + button with a circle around it.
Three buttons will appear:
Upload: if you have already recorded your audio and you want to upload it from your phone.
Upload: if you have alreay recorded your video and you want to upload it from your phone.
Record: if you want to record the audio.
Once you have recorded or uploaded your audio, you just need to publish it!