If you're using Rich + Markdown, canonical links need to be added differently.
Click on the engine icon at the bottom of the post.
A small window should pop-up:
Now you can add the canonical link.
You only need to add the link address like this:
And remove the rest.
To find the canonical path, do the following:
- Press F12
- CTRL + F and search for "canonical"
You should see something such as:
<link rel="canonical" href="https://yourblog.com/add-canonical-links">
I hope this helps!