This can only be achieved by creating a custom field for blog posts. Take a look at the second post in this forum thread
, where you will see an example on how to do that. In short, you need to add the value of the field in your web.config, then modify PostNew.ascx and PostEdit.ascx templates and map them to Sitefinity. You will find information on how to map your templates in the following KB
The 4.x version of Sitefinity offers this feature out-of-the-box. The name of the author of a blog post is displayed in each blog post.
All the best,
the Telerik team
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