If you see an unsecured connection when you open your site, that means that you have a mixed content issue. This problem can occur even when you enable HTTPS on your site. Most often, images, JavaScript, or CSS coming from an insecure server are the problem.
To make the required fixes, you’ll need to understand precisely what mixed content is first. When complete, your site will be more secure – allowing it to rank higher in search engines. You shouldn’t leave these issues unattended!