However, if you want to include meta tags within your blog, you do need to edit its HTML code. Adding meta tags to your blog allows you to include information that may affect how well it performs ...

Meta tags, found in an HTML document's source code, do everything from describing a site's contents to defining the type of content that the page displays.

Meta tags are hidden on the page, but they, as well as all the HTML code on a page, can be viewed by selecting View/Source or View/Page Source from the browser menu.

The prerender-status-code meta element is an example of a non-standard meta element that also happens to not be supported by Google.