1. Go to MyGroups->Manage Groups
      2. Now click on Schedule
      3. Click on the date for the match you want to edit
      4. Move your cursor to the slot in the lineup you want to change
      5. Click Clear Player
      6. Clicking "Clear Lineup" will remove ALL players from the lineup and allow you to start again.   
      7. Click on the player you want in the lineup
      8. Repeat until all player slots are updated
      9. Click on Continue  to confirm the lineup