Building your lineup is as easy as clicking the plus (+) sign for your desired player from the list.
You can filter by various aspects to help you find the right player for your lineup, such as position, projected games, salary, player name and team.
You can find more on how to filter the player list HERE
As you build your lineup you can see the players selected along the right pane with salary commitments and projected points.
To remove players from your lineup simply click the red minus sign next to their picture 
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Once you are satisfied with the lineup you have built click “Submit Lineup”.