Run an instance. Follow the Docker guide, or clone the repo and run npm install then npm run serve. Play on :8080; open :8079/admin to create worlds and set your branding.
Join the private list. In /admin → Federation, set this hub's heartbeat URL and paste the publisher token the hub gives you. Your worlds then show up here under Private servers.
Pick a look, then a name + passphrase.
New names use letters, numbers, _ or - and need a 12–128 character passphrase. Existing characters use their current name and password.