@Braulio-Cesar-Holtz-Ribeiro you need to set the HTTP header for frame options on the site that is displayed inside the iframe.
NodeBB actually has a setting for this in the ACP. You should be able to find it by searching "frame"
how to set 'ignoring category' as default while a new user coming
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Use https://github.com/NodeBB/nodebb-plugin-category-optin but beware if you have thousands of categories and millions of users this plugin will create a lot of entries in the database.
