You will want to add players to your Drop In League.
Go to Menu > Manage > Players/Teams > Players.
1. Choose the Division.
2. Type the Full Player's name in the Search & Add Player Box.
3. Choose the right player from the drop down list.
4. If the right player is not in the drop down list, click on Click here to create and add this new player.
Repeat until you are done entering players into your singles/drop in league.