Find "Music"
Press All apps to open the main menu.
Press Music.
Create playlist
Press Library.
Press Playlists.
Press +.
Press the field at the top of the display and key in the name for the playlist.
Add audio files to playlist
Press Add songs to playlist.
Go to the required audio files.
Go to the required audio files.
Press the required audio files to tick them.
When the box next to an audio file is ticked (V), it's selected.
Press Add.
Press Save when you've ticked the required audio files.
Exit
Press the Home key to return to standby mode.