How to delete duplicate songs on my IPhone 4?

I just got the IPhone 4 and i'm fimiliar with the apple company so i know the basics. Someone told me to swipe to the right and a red button saying "Delete" will pop up, but it just clicked the song.i've been trying to delet the songs for days and its so annying and frustrating, its even caused tears lol. Please just explain.

Really simple. Just slide left to right over the song and the delete option will appear. If it doesn't you prob have firmware lower than ios 5 (you haven't updated) if the sliding doesn't work you have to hook it up to itunes and do it manually in the library.

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