I would like to create a prediction game with matches from different competitions, like all matches from both the Premier League and the Championship.
Go to the admin area and then to the "Prediction calendar". There you can add individual matches or an entire competition.
Go to "Add matches". The first step lets you choose the season from which you want to add matches. The second step lets you filter the list in order to choose the right matches to add.
CAVEAT Watch the optino "create new matchdays": If this option is enabled, all new matches will be assigned to newly created prediction matchdays. Otherwise, matches will be inserted into the existing matchdays in a chronological way.
To finish step two, click the "Show matches" button to update the view.
The third and final step lets you check and validate the settings.