A pass is one full run over your footage — analysis, edit, preview, timeline. Refinements of a cut you've already run are free within that pass. Start free, upgrade when it's earning its seat.
Paid plans start with a 7-day free trial with full Editor features (card required; cancel anytime before it ends and you won't be charged). Subscriptions are managed inside the app and renew monthly until cancelled. See Support for plan details, billing, and cancellation, or the Terms of Service for the fine print.