BN is benched, but you benched them, not their real world coaches.
They are the players on your team that you haven't placed into a spot to play, and the points they score don't count towards your totals. Your bench didn't do much, but Williams would have been a better play than Warrick, who was held out at the last moment.
The red letters by the players names are the officail injury status, Day to Day, probable, questionable, etc.
BYE is off that week and they need to be on the bench; guaranteed zero points there.
Lastly, a red NA means Not available, and that player is either out of the league, right Ricky?, or on suspension. Drop or bench them, just like an IR, which is out for the season.
Any more ???
Lemme know.