If you follow the article that was linked to in post #2, it will cover pretty much everything you need.
You do need to follow it carefully though.
Have you definitely had your host install an SSL certificate for your site? As you need to this, and currently if I go to
https://jandeane81.com/ I get this:
ERR_CERT_COMMON_NAME_INVALID
It's not enough to just change the url to https, you do need an SSL certificate on the server too.