It just means to start your title with a label such as “News:” or “Editorial:”. You can see details in the sidebar.
Gotcha. Sidebar here doesn’t have that info but clicking through to the kbin page shows them (not sure if they’re different things across platforms or just haven’t sync’d). That rule makes sense, just wasn’t sure how to comply with it.
Still learning how all these different federated platforms work together / what features won’t work where, etc.