It already IS a BP.
Open the bp.txt file ( it has BP language in it ). Copy it all to the clipboard ( CTRL-A, CTRL-C ).
Then open your level BP and paste ( CTRL-V ).
Some of the variables will not be setup. So when you try and compile, you’ll get errors. You need to right click on the errors and choose ‘create variable’.
You’ll also need to enable keyboard input in the level BP. Click the ‘Class defaults’ on the tool bar and set ‘Auto receive input’ to ‘Player 0’