First off, log in to nba.com/drive and you will see something like this...
Click on "SELECT", and you will be presented with a list of players.
I recommend sorting the list by "AVG POINTS" because total points accumulate and screw up the list -- we don't want that.
Now scroll down the list and look for a player whose team you THINK will lose the round. Remember! PLAYER ON THE LOSING TEAM :) If you pick a player, that player can no longer be picked later in the playoffs.
When you have decided which one, click on that "SELECT PLAYER".