Hello Milkman Dan,
I would recommend you create your own control that inherits Sitefinity BlogArchive
class and override RenderBeginTag
methods. Please note that you should register your custom control in the web.config file to display it in "Add Controls
| <add name="BlogsArchiveExt" section="Blogs" type="MyNamespace.BlogsArchiveExt, app_code" />
For your convenience I have attached a simple example.
the Telerik team