Need to edit/"clean" A song, can anyone please help???

For an end the year school project, I'm working on a powerpoint of the Sierra Leone Civil War, and want to use the song "Propoganda" by Dead Prez in the background. Problem is, I can't find a clean version of the song, and there's a word or two in the song I don't feel like showing to my whole class. If anyone know a simple way to edit this, or could help me/do it for me, I would be very greatful. I don't have a clue how to do it. Basically, I need to get rid of anywhere it says shit, fuck, ass, or nigger, a total of 5 places in the song that need to be edited/bleeped out, or just make the track stop playing for like half a second so you don't hear the word. Thanks.