The things to do first is setting up Tistory(http://www.tistory.com)'s environment. If your blog address were http://youraddress.tistory.com . Go to admin pages like this address http://youraddress.tistory.com/ admin/setting/api . Then enable it by clicking button "Using Api"
And second is running Microsoft Word 2007.
Click "New document" and " New blog post".
It'll show dialog box as below.
Select others with Provider and select MetaWebLog with API(A) in New account dialog box. Set post url with your own blog address plus "/api" for example http://youraddress.tistory.com/api
And fill user name and pass word .
Now everything is done. Just use it as word