You need to predict the first goal per team; this means you need to select a player for the home team and the away team. If you don't think anyone will score, choose 'No score'. If you think it will be an own goal, select 'Own goal'.
Example: England - Netherlands results in a 0-1 because England scores an own goal. In this case you score 4 points when you selected 'Own goal' for the Netherlands (and not England!).
For the World/ Euro Cup the matches of the day will become available as soon as the players are made public (3-4 weeks before the start of the tournament).
The player with a * is the most selected player for that match (to give you a hint on who to pick).