It is open to everyone...$10 per entry. Here's how it works:
Week 1 of the NFL season you pick 1 team to win their game. No point spread involved, just straight up wins.
If the team you picked wins their game, you move on to Week 2 and pick another team. You cannot use a team more than once....unless you're still alive when the playoffs start, then teams are reset for use.
If the team you pick ties or loses or if you forget to make your pick, then you're eliminated. The last one to survive wins the pot....although it has been split the last 2 years.
Last year the final four agreed to split the pot. Two years ago, the final 9 players all got eliminated in the same week.
I'm using
www.usafootballpools.com to run the league this year. You just logon (once registered) and it will show you that week's schedule so you can make your pick.