Write a song the way you would in Suno. Or upload one and restyle it.
Create uses lyrics and a style. Cover uses the upload box: YuE2 keeps the melody and generates a new performance. Both need a GPU worker running on this PC or a rented GPU. Vercel only hosts the website.
GPU worker is not connected, so Generate cannot create a song yet. The button only reaches this website. Start the worker on the machine that has YuE2, then refresh.