how do i upload downloaded song on my iphone

i have pre-ordered an album form iTunes on my iphone 5 & received an song as a download , was charged for it and all ....but it doesn't show up in my purchases to redowload back to my phone or in my cloud as a song that was bought , the only way I know is when i sign in to my iTuens I see it was bought , but no way to redownload the song to my phone or through iTunes on my computer either , how do I recover the song to redownlaod b/c I was charged & have a receipt to show