Your probably open your blog with your browser, search for the post and copy the URL when you want to link to a previous post you . It doesn’t take much time doing it but there is a faster way to link to a previous post with the Windows Live Writer.

Select the text you want to turn into a link and click on the hyperlink icon or press CTRL + K

In the “Insert Hyperlink” windows click on the “Link to” button next to the URL field and then hit “Previous Post”

Now you can see all your previous post and choose the right one

Click on ok and the link is set.

via Jamie Thomson