I installed WordPress and selected https//:www. However, when I go to the site I can't see the SSL lock icon but when I log through the backend it shows the SSL lock icon. Can someone advise me about how to fix this? Thank you!
Yes you can check it with the SSL decoder that will help you to understandΒ 

https://decoder.link/sslchecker/

I will enplane it future now you can check it with this tool and understandΒ