You would make the og entries in UBB CP
Display-general-tab html includes
In Header Insert For All Pages
For a guide on what tags to insert see:https://ahrefs.com/blog/open-graph-meta-tags/https://developers.facebook.com/docs/sharing/webmasters/
Also after posting the first time to facebook I have found if I make any edits to the meta tags. They are not immediate nor back dated.
So all existing posts do not seem to update at first and new ones take a while to change. Probably due to some caching issue with facebook.