Add canonical tag to head on posts?

Let’s say I blog at and host a forum at
I’d like to copy/paste some of my blog posts onto the forum.

In order to avoid any SEO ‘duplicate content’ issues, I’d like to add a tag into the of these topics:
<link rel="canonical" href="" />

Is there any way I can do this?
Thank you!

Info about ‘duplicate content’ & ‘canonical tags’

This has been raised before, we do not offer a mechanism at the moment to make the canonical for topics point at the original on WordPress.

We may add support for this one day, but there are no concrete plans yet.

This has been discussed previously here: