Lightsail Django python Linux

I'm a Newbie. setup the views.py, pointed both urls.py files correctly. created example.html. I setup staticIp and DNS zone. Everything works. when I run server and type ip address, I get my example.html page, as expected. But when I type my domain name in the browser, I get the index.html startup page. my Question: How do I get the domain name to resolve to the instance (my example.html page, rather than, the index.html startup page ? appreciate any help or comments, Thanks