If you are using a plugin like Yoast, you may add canonical tags by: 1. Logging in to your WordPress website. 2. Next, access the post, page, or taxonomy for which you want to change the canonical URL. 3. Click on the ‘Advanced’ section in the Yoast SEO sidebar or a meta box. 4. Enter the full canonical URL, including http/s and www or non-www, in the ‘Canonical URL’ field. 5. Update the post, page, or taxonomy. Then you are good to go!