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In the Space Permissions you can give Anonymous user to Add a comment. Anonymous user are those who are not logged in and usually don't have an account. You can ask users to logout and then add a comment.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.