iTunes on an iOS device is a link to the store for buying media, it is not anything like iTunes on a pc.
You consume media by using the movies or music app, none of which has anything to do with syncing.
Need more info about the problem you are having.
Error messages, what happens when you try to sync, etc.
Thanks - I was afraid my IPad was malfunctioning. When I try to to update my iPad 2 to version 6.0.1, I get the message "there are purchased items on your iPad that have not been transferred to your iTunes library. You should transfer these items to your iTunes library before updating this iPad. Are you sure you want to continue?". I don't know how to do that.
If you want to transfer iTunes Store purchases from an iOS device or iPod to a computer, be sure to authorize the computer before connecting the device. To authorize, follow these steps:
From the Store menu, choose Authorize Computer.
In the dialog that appears, the Apple ID button is selected by default.
Enter your Apple ID and password, then click the Authorize button.
If the iTunes Store purchases on your device were purchased with multiple accounts, you will need to authorize the computer for each one.
To transfer iTunes Store purchases from your device to a computer, follow these steps:
Connect your device to the computer. If it is synced with another iTunes library, the following dialog may appear:
Click the Transfer Purchases button.
Important: Clicking Erase and Sync will delete any existing content currently on your device. The content will be replaced with whatever existing content is in the current iTunes library your device is connected to. If there is no content in the iTunes library, nothing will be synced to your device, and your device will be empty.
iTunes will begin copying any purchases made with any account for which the computer is authorized.
If when you connect your device you are not prompted by the dialog above, it could be that the option "Do not ask me again" was previously selected. Fortunately, there are two more ways you can copy your purchases from your device.
After connecting your device to the computer and its icon appears in iTunes, you can choose Transfer Purchases from "Your device name" from the File menu.
Or, you can right-click (Windows or Mac) or Control-click (Mac only) your device in the iTunes Source list, then choose Transfer Purchases from the shortcut menu that appears.
Please note that this feature only works for items that were purchased on the iTunes Store. Any items imported from audio CDs or acquired from other sources will not copy from your device to the iTunes library.