To post a message to the blog usually is used various tools implementing a blogger APIs as clients. These are standalone tools running on a PC or other platform, but not in all cases one have these tolls on hand. Therefore a web interface is needed. The default home page (index.vspx) implements authentication schema and allows blog owners to post to their blogs. To login to that page blogger should go to the site home page and when supply valid credentials will be authenticated and thus possible to make posts/edit existing etc. For authenticated user in that case is also possible to change details, settings channel subscriptions.