Aşağıdaki numaraya sahip doğrulama bölümünü nasıl kaldırabilirim?
that's not wpForo feature, that comes from other plugins. Just go to your Plugins' admin page and disable the plugin which does it. I don't know that plugin name, but you should guess it if you read all your plugin titles.
@martin Hello. Thank you for helping me. however, my problem remains unresolved. I removed the add-ons, as you said. however, the problem still persists.
Just delete all caches twice and make sure you've disabled the correct plugin. Make sure all caches are reset properly. That's all, nothing else can be recommended by this forum, wpForo doesn't have any relation to that math question, so you just need to properly find and disable the plugin which does it, and make sure your website cache is cleared fully.