After you verify that you control your domain, the certificate's status will change to Valid.

Your next step is to attach the certificate to your Lightsail load balancer.
-
From the Lightsail home page, choose Networking.
-
Choose your load balancer.
-
Choose the Custom domains tab.
-
In the Certificates section, choose Attach certificate.
-
Select a certificate from the dropdown list.
-
Choose Attach, to attach the certificate.