HT4972 Update iPhone 3G iOS 4.2.1 to later version

I have just acquired an iPhone but none of the apps I am interested in will run on the installed iOS 4.2.1 installed.  The model number is A1241, 8GB.
I read the Apple support article (HT4972 and HT4623), which says to use iTunes to update iOS 4 to iOS 5 or later, but the instructions on how to do this are so terse as to be useless. I have been thru' Settings/General, but there is no Software Update button in there, and I can't find any software update button in any other menu.  How does a normal mortal manage to update iOS!  It doesn't help that this forum pulldown below doesn't list the Version 4.2.1 (8C148) that is shown in the General/About/Version path...
Thanks...

Ironic1970 wrote:
I have just acquired an iPhone ... iOS 4.2.1 installed.  .
Sorry... But... the iPhone 3G can Only go as far as iOS 4.2.1

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