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I want to implement player registration. Is that possible?

Yes it is, however not with this plugin, but with my ProjectManager. It is designed to manage any recurrent datasets, such as player profiles. It is also possible to set a hook in the user profile. Any user with the capability projectuserprofile is able to use this feature. You would also need the Role Manager for access control. Further the plugin has a template engine implemented that makes it easy to design your own templates.

How can I display the widget statically

Put the following code where you want to display the widget

<?php leaguemanager_display_widget( league_ID ); ?>

Replace league_ID with the ID of the league you want to display. This will display the widget in a list with css class leaguemanager_widget.