The deadline to make team changes for the next week's tournament is 2:00 a.m. PT each Thursday.
If you don't make any changes by this deadline, your team remains the same for the next tournament.
If you haven't yet created a team, you can create a new one when the current week's tournament has begun, but you don't receive fantasy points for any rounds already completed or underway.
This option is only available on the day you sign up for the game. Otherwise, your participation begins with the following tournament.