Permalink Plugin Video Training:
How to use Permalink Plugin to stop having broken and bad links if you change your Permalink structure mid-stream of using your blog (ueah, very important). Download the “Dean’s Permalink Migration” plugin you’ll see in the video to make it all work lickity split.
I don’t know if lickity is a word, but you know what I mean! 
This is the internet video explanation for it
Tags: change, explanation, help, new, permalink, plugin, structure, tutorial, video, wordpress