Go to your site.com/wp-admin to login in your Dashboard.
when go to dashboard of your site, here you can see Not Secure.
From left side panel hover on Plugins then Click Add New.
Here u can see Search Bar from right Side Click on it and Type SSL.
After Search SSL, you can see many
more Plugins Now Click on Install Button of Really Simple SSL.
After installed Plugin Click On Activate Button.
After Activation of Plugin, Go to left side panel hover on Settings then Click SSL.
Scroll Down and Here you can see SSL certificate Detected.
Here you can see Button on top, (Go ahead, Activate SSl!) Click on it.
From left side panel hover on Elementor then Click on Tools.
Now Click on Regenerate Files Button.
After Regenerate CSS Click on Sync Library Button.
After Sync Library Click on Replace URL on top.
Now, Copy your Site URL Address.
Now Paste Exact URL Address of your Site in right side blank of Update Site Address (URL).
Now Paste Exact URL Address in Left side blank and Remove 'S'.
Now Click On Replace URL Button.
Now Click On 'OK' Button.
you can see here that your Website Is Secure Now.
Congrats, you're done with it!