LG Fusic / LX-550

I press and hold the center button twice and it brings me to the media file which is empty. i can't navigate to the music file from the outside of the phone. The only way I was able to remedy this was to connect to my pc and put my music and dci folders inside the media folder. this si fine for now but is there a better way to get to the music folder from the outside of the phone?

Also is there any way to lock and unlock the buttons from the outside of the phone while its playing music?

I love this phone by why the hell is it so difficult to use?