I won't get an email from Apple?

It was suppose to send me an email to my inbox to change my security questions, since I don't remember them. I wanna buy songs on my iPhone, but my friend sold me his(one I have righ now), so I need to answers those questions. I tried 3 times, and all there times it's said I was sent some instructions, but they don't appear! I didn't get them!

Have you checked your junk mail folder?

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