Hello,
Thank you for your question about SSL not secure after installation. I ran a check on the SSL and see it is installed and has the proper trust chain.
The reason the site is showing as non-secure is because it has insecure content such as images that use http:// in their URL and not https://
As the page is simply the place holder, this is not a big deal, but once your site is in place, those images, links, etc need to be set to https.
Your SSL as it stands, however, seems to be set up properly. You can view the confirmation by visiting the link for your site at SSL Shopper's SSL checker..
Kindest Regards,
Scott M