How do you put msl in pes 2012?

To put Master League Soccer (MSL) in PES 2012, you'll need to create a custom league since MSL is not officially included in the game. Navigate to the "Edit" mode, where you can create a new league and teams. You can then customize the team names, logos, and player rosters to reflect MSL. Save your changes, and you'll be able to play with your custom MSL setup in the game.