All logged out visitors to your blog see an anti-spam word under the comment form. To post a comment they must enter the correct anti-spam word.
The anti-spam word is designed to confirm your commenter is human. It protects your blog against automated spam comment scripts.
You can read the different ways Edublogs protects your blog against spam comments here.
You can’t disable the anti-spam word on your blog because it is needed for security purposes. We’ve made the anti-spam words as student friendly as we can while ensure they protect your blog against automated spam comment scripts.
The best option is to add your students as users to your blog, and get them to post their comments as logged in users, if they are having trouble with the anti-spam words. Logged in users don’t see and aren’t required to enter the anti-spam word.
Here is where you’ll find instructions on how to add students as users to your blog.