1) Kunena Configuration -> Security -> Security Settings -> Allow Guests to Post/Write = Yes
2) Categories -> Display Category -> (tab) Category Permissions -> Add “Public”:
It is recommended that, if you allow guests to post messages in your forum, you should use some form of spam defence or counter-measure; if you allow guests to post messages in your forum, it is suggested that you also set the value for the option Display Captcha.
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