If your question isn't here, the tutorial and prerequisites pages cover most of the rest.
sudo /etc/anvil-installer/get-link.sh — it reprints the full, clickable links for both the Installer and Server Manager (they share one token). Note it down somewhere this time — a notes app, a bookmark, anything — since it's not re-printed anywhere else automatically. No terminal access either? Both dashboards' sign-in page also accepts your regular Linux username/password (checked via PAM) as a fallback, no token needed.