The first parameter for the {{Blogger}} template is the name of the Blogger account. This can be found in the page's URL. For example: if the URL is http(s)://example.blogspot.com, then the account name is example. The second parameter is the description or display name.

In this example, the Blogger blog is googleblog and the description in the link is Google:

 {{Blogger|googleblog|Google}}

Google on Blogger