How to sync music to iphone?

I have the newest itunes software and its way different and i want to sync music from my itunes library onto my phone but i can't figure it out… Please help!

Added (1). I've tried everything and its not working! I don't know what's wrong.

1.plug in USB to iphone
2.plug USB into USB 2.0 on your computer.
3.open itunes.
4. On the top right corner will be "Rachel's iPhone" or whatever it's called.click on it.
5. When that page opens, go to the bottom right and hit "sync"
6 that should do it.

hmm… Does step 4 show up on the top right?