Did a little follow up from @gogolfing on Yahoo's site.
The deadline to pick players for a new team or select any new golfers for your existing squad is 1:59 a.m. (Pacific Time) each Thursday unless noted.
These areas will show as "locked" if it is past the deadline to select your players for the tournament.
This article explains the applicable deadlines to edit your Fantasy Golf team each week, and make daily roster changes
There are two deadline types in Yahoo Sports Fantasy Golf.
The first deadline applies to adding and removing players from your roster for the upcoming tournament.
The default deadline to make team changes for the next tournament is 2:00 a.m. Pacific Time each Thursday but will automatically adjust to be 5 minutes before the first tee time of the first round, once that is known.
If you don't make any changes by this deadline, your previous lineup carries forward to 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 under way. This option is only available on the day you sign up for the game. Otherwise, your participation begins with the following tournament.
The second deadline applies to changing your active foursome prior to each round of the tournament.
Once you've selected your eight (two A, four B, and two C) golfers, you have until 5 minutes before the first tee time of each round to select your active lineup. For example: if you have Tiger Woods active as your A player and you want to switch to Sergio Garcia, and the first tee time is 8:00am PT, you have to make this change by 7:55 a.m. PT on Friday to have the change applied to the second round.
If you activate Garcia after 7:55 a.m. PT on Friday, Woods remains active and Garcia is activated for the third round (Saturday).