I´ve created a EC2 instance, installed a service and I was able to routed it to my address with Route 53. So I can go to example.com/myservice and see it on the browser.
However, in the browser, I get a small info card in the address bar that says
"Not secure" and information about not entering sensitive information.
What does this message mean? How can I avoid this message? What do I need to change in my existing setup?
All info is welcome, as this is fairly new for me.
This means that you are connecting to your website using HTTP protocol, not HTTPS. HTTP is not secure as all data is in plain text, while in HTTPS your data is encrypted.
To rectify the issue you can install an SSL certificate directly on your instance or leverage Load Balancer or CloudFront in front of the instance.
Some useful links from AWS documentation:
Tutorial: Configure SSL/TLS on Amazon Linux 2 for direct installation of the certificate
Add an HTTPS Listener for Application Load Balancer
Using Alternate Domain Names and HTTPS for CloudFront