1. Go to Admin tool, select settings tab, under comments settings, make sure “Use Disqus as a comment provider” is unchecked
    • How to make reCaptcha plugin work in your BlogEngine.NET
  2. Go to Extensions tab, make sure the “SimpleCaptcha” extension is disabled. (This is very important, because the reCaptcha extension’s priority is lower than the SimpleRecaptcha!)
    • How to make reCaptcha extension work in your BlogEngine.NET 
  3. And make sure the “reCaptcha” extension is enabled and set your own public key and private key properly.
    • How to make reCaptcha extension work in your BlogEngine.NET
  4. You are all set now. Log off from Admin tool and see it from the comment part of the blog post.
    • How to make reCaptcha extension work in your BlogEngine.NET