Do I need an account to publish a wallpaper?
No account is required — your Wallper app is paired with a hardware ID. Just drop the files, add your author name, and submit.
Wallper does not ask you to create a separate account to publish wallpapers. The macOS app is already paired with a hardware identifier, so authorship is bound to the device that uploads the file.
When you submit a wallpaper through the Upload page, you can add your public author name and an optional link. That name is then shown on every gallery card the wallpaper appears on.