How to upload music into my iphone from another computer?

I'm visiting my sister and I want to download my music to put in my iPhone 5, I don't want to erase any of my shiet tho, you know what I'm saying? Good. Welp if this is even possible, let a ninja know and if not… Also let a brotha know. Thank you for your valuable valuable time. I love you.

When you connect your phone with any system then firstly it's drivers are installed then you can proceed further…

So ones all required drivers of iPhone installed in computer you will be able to upload music from this…

Try it if you still face any problem kindly let me know.

You don't. You sync to your library, and only that, as it is what contains the track that you have certain rights to.

You have zero right to the tracks your sister has, and she has zero rights to let you have copies of them.
If you want those tracks, you need to buy them yourself.

That you can't pirate music that way is one of the benefits of the iPod sync scheme.