There are a few different ways to find your canonical URL. One way is to use the Google Search Console. This tool will help you to find any pages that have been indexed by Google, as well as any pages that have duplicate content. You can also use a tool like Screaming Frog to crawl your website and look for any duplicate pages. Once you have found all of the potential duplicate pages, you can then use a tool like Moz's Canonical URL Tool to find the correct canonical URL for each page. Finally, you can also ask your web developer or hosting provider for help in finding your canonical URL.