How can I declare a page canonical?

How can I declare a page canonical?
Screenshot 2024-01-26 at 8.58.58 AM

Hi there, can you provide a link to your website or a detailed review (of the screenshot) so we can advise how to help you?

Thank you for your response!

Here are my websites created in VZY.

https://joeyscykelverkstad.se/
https://theblackfoxbarbershop.com/
https://theseodad.org/

This is interesting to be public so we can solve that problem in our end.