1. When you open Writer for the first time, the setup wizard will ask you whether you want to create a new blog, (Microsoft has partnered with Wordpress.com for this), or choose to log in to an existing blog that is supported by Windows Live Writer. At this time, most of the major blogging platforms are supported, so whether you are with Blogger, TypePad, Wordpress, Atom or LiveJournal, you should have no real trouble setting up Writer. Simply select the most relevant one to you and click Next.
2. Next, enter the URL of your blog, and the user name and password that you use to log in to your account. Click Next and Writer will attempt to authorize your account details.
3. After your account has been verified, you will receive a pop-up window asking whether or not you want to download your blog theme to Windows Live Writer. This is a good idea as it allows you to see exactly what a published post will look like according to the formatting you have chosen online. So, click Yes and wait for Writer to download and install your theme.
4. The last step of the initial setup is to name your blog. Naming blogs is especially helpful if you have more than one connected to your Windows Live Writer so try to choose something that will set it apart from any others you may have to help avoid confusion. Click Finish when you are done.