HT4623 my iphone 3G dose not show a data update button, so how do I get the ios 5.1 update installed on phone and computer?

I have gone to general-->and there is not software update button for me to download ios 5.1. I have purchased icloud and can't access it becuase it says my password is not valid with the icloud account. so I guess this is 2 question I am asking for help on.

You can't upgrade a 3G to iOS 5.  Only 3GS and newer support iOS 5.

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