If you have a new blog or if you have installed a new theme for your website/blog then there are some chances that it won’t completely secure, as in, using http instead of https. If you have a WordPress blog you can almost fix this by installing “Really Simple SSL” but it can’t reach everywhere and fix everything. In such cases, open Google Chrome browser and “Inspect” the page, then go to “Security” tab, you’ll find something like this:
If it’s not loading there, enable “Load Unsafe Scripts” and you’ll find the ‘http’ links.
Here you can easily find the list of Non-secure origins, find them and use https or replace them with any relevant https link. This should fix the SSL insecure issue on your site. Do let us know if you have any queries.