HT4623 I do not see Software Update option in my Ipod. I have 3.1.2 os

Question

Shouldn't there be an article on how to update the ios software???
On the main website, Apple says "just plug in and follow software instructions"
Really?? Is that easy? I dont think so. Will someone tell how to actually do it???

Answer 1

The option to update on the iPod itself is not there until you have iOS 5.1 on the iPod.
Admittedly, Apple's instructions about this are not clear. It apparently says to use that feature to update to the iOS version that has that "new" feature. Weird!
Anyway, back to you;
The usual procedure is connect the iPod to your iTunes Library and look on the Device/Summary pane (tab) for the Check for Updates button and use that. Either, you see a message telling you that an update is available and the option to choose it or, you see a message telling you that your iPod is up to date.
Since your "additional detail" at the end of your post states that you have iOS 3.1.2, that suggests that you may have a 1st generation iPod Touch, in which case you should get an option to update to iOS 3.1.3, although I was unaware that there ever was a 3.1.2.
However, be aware that;
The 1st gen Touch can only go as high as iOS 3.1.3
A 2nd gen Touch can only go as high as iOS 4.2.1
The 3rd & 4th gen Touch can use iOS 5.
See http://support.apple.com/kb/HT1353 for help in identifying your the generation of your model.