How do I sync music to my Iphone from my Windows computer?

Hi tetafrommi,

First, you may want to choose to have the sidebar displayed so we can see connected devices:

iTunes 11: Frequently used features

http://support.apple.com/kb/HT5649

Afterwards, your device should be displayed if connected:

We'll want to click on it, and choose the Music tab at the top. Let's make sure "Sync Music" is checked:

For more information, see this resource:

iOS: Syncing your data with iTunes

http://support.apple.com/kb/HT1386

Thanks,

Matt M.