How do i sync my music from itunes to my iphone?

I've been sitting here for over an hour trying to get my music from itunes on my computer, to sync to my iphone. And everything i try, ISN't working. I'm getting so frustrated, i'm about to throw my laptop… Please help me. And don't make it complicated, make your answer easy to understand i'm bad with itunes… Obviously.

Open up iTunes and plug your iPhone in. On the top right corner, under the search bar, you will see a button that says iPhone appear. Click on it (not the arrow part). Now on the bottom right corner of your screen you will see the sync button. Just click it and the sync will start.

The answer below is correct, but to the follow those instructions, please make sure you have version 11.0.1 installed on your PC. This was realeased the week before Xmas:

If the software is not up to date, thia may cause an issue.

You can update here if you need to to:

http://www.apple.com/.../download/