You have to prove it again every week.
The futures market is only half the game. Every week you build a card from the real football board and put a required piece of your bankroll at risk.

The card has a real shape
A complete NFL sheet has five game picks, one live underdog moneyline, and five player bets. The required mix keeps the room from loading up on the same obvious favorites.
You decide how to spread the weekly ante across the card. Confidence matters because a strong opinion can carry more of the risk, but one bad stand can hit harder.
The underdog is mandatory
Every manager has to pick one team to win outright as a dog. No points and no safe favorite. Somebody in the room has to explain why they believed in it.
That pick creates the receipt people remember. When it hits, you look sharp. When it loses immediately, the league room usually handles the recap for you.
The whole sheet locks together
The deadline is the first kickoff on that week's schedule. The server freezes every submitted card at the same time and rejects late changes regardless of somebody's device clock.
After every game is final, the sheet settles and becomes a permanent weekly receipt. Six hours later the next week opens, giving the room time to enjoy what just happened.
Create an account and run the tutorial.
Then start a private league, use a friend's invite, or grab a seat at a public table.