SSL Certificate Help

I recently purchased a SSL Certificate from GoDaddy. I thought “that was all I had to do” as I’m new to this side of websites. My site still reads “Not Secure” and GoDaddy said I had to set up something in my coding. 

HELP!!! How do I do this?

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/1/feed