I know it was dumb obvious, and the shortcode was listed in the description.
But it still took me a good 10 minutes to even find it!! I was going crazy, and I never though to look back in the description to find it.
Usually when I use a plugin I have all the information in the plugin.
Can you maybe mention [hmp_player] in the display section or maybe add a button to the editor for new people? That might help.
Great plugin (Amazing idea for dual mp3/ogg support). Keep up the great work!!!