SSL for Heroku and Namecheap Redirect

I have a Heroku App going on with one of the basic paid dynos. I also have a domain registered with Namecheap and I think I bought an SSL. I linked my domain with my heroku app, however, the navigation bar does not show the green lock that appears when the connection is secure. I need an expert for this quick work. I just don't have the time to read through the documentation to figure it out by myself. TLDR: Need green lock on navbar. Connection between Namecheap domain and Heroku app.