How to mix vocals over a beat?

How do I mix vocals over a beat? I would appreciate step by step instructions from the very beginning. I don't even know what I would have to download to do this. If possible is there any way I could do this with an iPhone?

You could probably do it in garageband on your iPhone as long as you have the vocals track and the beat track.

Just send em to me and I'll do it for you, just gimme some kinda credit

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