How to update iphone 3GS?

Im a newbie at updating an ios, i want to update my 3gs to ios 5.1 but i don't know hoe to do it.can you help me?

http://support.apple.com/kb/HT1414
Make sure you have all your content in iTunes, as the update to iOS 5 will erase your iPhone. After the update, Restore the iPhone using your most recent backup, then resync your apps and content.
Regards.

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