Metabox Not Appearing When Editing

Hi, I’m new to WordPress so I apologize if I missed something obvious. I’m trying to use the RankMath plugin when editing pages on WordPress but the MetaBox does not appear in the Gutenberg Block Editor. I also don’t see the plugin in the 3 dot (more tools & options) dropdown. So far I’ve only been successful in using RankMath through Elementor but some of the pages I’m working on don’t use Elementor. The website I’m working on is http://www.greatwallpark.com I’ve looked up previous forums and videos on this issue but I haven’t found a solution yet. Here is a link to what I see when editing a page. https://ibb.co/1TnLCLk Thanks for your time and help!