luceos The admin area provides no functionality to manage that file. You can manually create one or use an online generator and then upload it to your website storage.
girefko You can use the below extension to create one automatically https://discuss.flarum.org/d/18316-flarum-seo Adds robots.txtto your forum, when Sitemap extension of FriendsOfFlarum is enabled, the link to your sitemap.xml will appear in the robots.txt
