Adding new songs to home sharing?

I have downloaded some songs (not on iTunes) and I have home sharing turned on on my computer (but it is nit the principal home sharing computer). I was wondering how to put these songs on my iPhone? I tried to add them but they said they couldn't because of home sharing. I don't have an apple computer if that is helpful.
The songs work fine on the computer. I tried to firstly sync my phone but they didn't transfer and so I tried the 'manually add songs' but it wouldn't let me!
Thank you!

Added (1). No the Home Sharing device on iTunes. But I have a windows 8 computer.

Do you mean on windows? If windows then just right click on the files or folders and then choose "share with" then homegroup(whatever you made). If else then there's a problem on your files.

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