It is not safe to pulicize your serial number. For your protection I have pointed it out to the hosts, who may remove it. But the post will stay.
You may find the link below useful which explains how to use iTunes to update.
Message was edited by: seventy one
The option to update without the computer (Over the air) was made available with iOS 5. If your iDevice is using a version of iOS lower than 5, you will need to use iTunes on your syncing computer to perform the upgrade. Use the Apple link below as a guide for the upgrade.
Also read the instructions from the section entitled "Update your device using iTunes" at the link below.
Information regarding transferring purchases from your iDevice to iTunes on your syncing computer can be found at the link below.