It is easy to set up. You just input your log-in credentials such as your user name and your password for blogger when the user interface asks you to.
You can find this option under NEW > Blog Post when you click the Microsoft Office logo in the top left corner of your Microsoft Word Window as shown :
Select the "New blog post" and click create.
Then you are presented with a clean page ready for your blogging hands to go through.
It is convenient to use Microsoft Word for blog posting because Word comes with all sorts of tools for your own use such as spelling and grammar checkers. It is fast and very easy to use because we have been using Microsoft Word for our documents too.
It is using Word for something other than documents too.
When you're done, you can either save it right in your computer or publish it directly to your blog with the publish button.
Just to inform you, I'm using Microsoft Word for my blogs in blogger just because I am not good with spelling and my grammar is not good so it is really convenient for me.