No software update on my settings page!! Any idea's?? It should be between "about" and "sounds"

What version of iOS are you currently running?

The Option is only available in iOS 5 and above. If you have iOS 4.3 you'll need to connect the iPad to a computer running iTunes and update through there.

Did you read the entire article? See the last part in this copy and paste from the article that led you here.

Additional Information

Tips for updating your iOS device

• Ensure that your device is backed up to iCloud or back up with iTunes before updating. Find more information aboutbacking up your iPhone, iPad, or iPod touch.
• If you experience an alert when updating your device with iTunes, see this article about resolving update and restore alert messages.
• When updating from iOS 4.3.x or earlier, see iOS 4: Updating your device to iOS 5 or later.

iOS 5: Updating your device to iOS 5 or Later

http://support.apple.com/kb/HT4972

If you are currently running an iOS lower than 5.0, connect the iPad to the computer, open iTunes. Then select the iPad under the Devices heading on the left, click on the Summary tab and then click on Check for Update.

Tip - If connected to your computer, you may need to disable your firewall and anitvirus software temporarily. Then download and install the iOS update. Be sure and backup your iPad before the iOS update. After you update to iOS 6.x, the next update can be installed via wifi (i.e., not connected to your computer).

 Cheers, Tom 😉