how do i activate phone using itunes

Google is your friend.

http://store.apple.com/us/help/iphone#carrier_info

Activate Your iPhone

Activating your iPhone is easy! You can activate over a Wi-Fi network, or activate and sync your contacts, music, photos, and more through the latest version of iTunes.

To activate with iTunes, you'll need:

• Your iPhone
• The latest version of iTunes - Download
• Your Apple ID - What is an Apple ID?

Just connect to your computer and iTunes will guide you through activation, as well as sync your music, video, bookmarks, and contacts.

Help!! I have connected to iTunes but nothing is happening. I'm just looking at an empty iTunes page... no prompts

anyone?

This thread has been dead for 3 1/2 years. You might be better off starting a new one...

What version of iTunes are you running?