Before you add a drupal blog, you need these:

API address

The API address of a Drupal site is http://url.to.your.drupal/xmlrpc.php.
If your site is http://yoursite.com/ , then your API should be http://yoursite.com/xmlrpc.php
If your site is http://yoursite.com/drupal/ , then it should be http://yoursite.com/drupal/xmlrpc.php

User name

User name is the one that you use to log in drupal

Password

It's the one that you use to log in drupal

Blog API is a core module in Drupal, but by default, it's disabled.
So you have to enable this module in admin/build/modules page.
Besides blog, Drupal has many other content types, you can also choose them to access with blog API.

After the setting is done, launch BlogSync

1. Enter add source page
2. Choose metaWeblog api
3. Input API address, username and password, Click add
4. If everything is ok, After a while BlogSync will list all accessable content types, you can choose some or all of them to add to BlogSync