Return to the Lightsail console home page and choose Networking from the horizontal menu and click on the name of your previously-created load balancer.
Under Target instances choose PHP-fe-1 from the dropdown list
Click Attach another
Repeat the previous three steps for PHP-fe-2 and PHP-fe-3
From the top of the screen copy the long string following DNS name:. This is the URL for your Lightsail load balancer. Any requests to this URL will be routed to one of your three front end instances.
Paste the string into a web browser, the Todo application should come up. Reload the page and notice how the host name at the bottom of the screen changes - this indicates that traffic is being routed appropriately.