you ca be able to set file from sd card as ringtones in LG VX9400

You need to edit the mp3 to make it a smaller bitrate and between 20-30 seconds long. Basically the file size needs to be 192kb or less.

Put it on your microSD card in the my sounds folder.

Then, on your phone, go to menu->get it now->music&tones-->my sounds.

Select the mp3 you want and press send in message.

Send the message to yourself.

Once you receive the message you will have the option of saving the file as a ring tone.

Hope this was explained well enough.

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do i cut the music and how to i keep that file to mp3 because when i tried this after i cut the song it went to a different format

As an option you can use this free tool
[Only Registered users can see links . Click Here To Register...]
It seems very easy.