How do I show the contents of a link instead of just the link?

I want a post in a thread to be the contents of a wiki page.

If I post a link, it just shows the link.

I believe that the forum software (Discourse), only supports embedding of certain limited content types. You can learn more at http://meta.discourse.org

Embedding of that sort will also only work if the URL starts on a fresh new line in the editor. No spaces, bullets, etc., and not in the middle of a paragraph.

The proper form, anyhow, is to paste the URL, and use the “Quote” feature (i.e., prefix each paragraph with “>”) to include a reasonable small portion of the article for context.

I posted a few that work, but the one I’m having trouble with is a link to the unofficial wiki.
It uses php so that may an issue.

the link is
http://thingsthataresmart.wiki/index.php?title=ThingsThatAreSmart_Wiki