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This site support webmentions. The most common way to comment is using Twitter or Mastodon.
Compose a new Tweets or Toots (for Mastodon) with the blog post link included.
Then go to the blog, paste you tweet/toots link, and click "Send Webmentions"
If you find my previous tweet/toots announcing my blog post, you can do "Reply", "Like" and "Retweet" too. That will be converted to webmention automatically.
Guess what?. You can always go back to the home page by pressing the blog logo at the top of the page.