By default, all liveBooks websites created after August 1st, 2017 automatically include an auto-renewing SSL Certificate, which is what places the HTTPS in your website's URL. All other websites will require you to re-publish and confirm the HTTPS update in your Dashboard. Please read below for important information regarding the security of your website.
Websites created after August 1st, 2017
If you have created a website after August 1st, 2017, your website is automatically served over HTTPS. Simply point your custom domain’s A-record (found at your domain provider) to the following liveBooks IP address: 22.214.171.124, then Publish your website. No other action is required.
Websites created before August 1st, 2017
If you have created a website before August 1st, 2017, that has already been published to a custom domain, you can redirect your website traffic to be served over HTTPS by simply re-publishing your website and confirming the switch.
Tip: You can enable the Publish button by making a small change on the website that you revert later after you have published. Keep in mind, once you Publish to HTTPS, you cannot revert back to HTTP later on.
If your Domains Have a "Legacy Resolved" Status
After enabling HTTPS, your website domain(s) will be set to a "Legacy Resolved" domain status within your Domain Settings dashboard. That means the domain(s) you have added are working correctly, however, it is resolving to an old liveBooks IP address. For optimal performance, simply point your domain’s A-record to the following IP address: 126.96.36.199
Please note: When your website is served over HTTPS, any third-party widgets or custom code that are NOT served over HTTPS will cause a browser error and result in a broken web page. You can check to see if anything is causing an error prior to switching to HTTPS by simply reviewing your website in the Design panel of the Dashboard. If everything is working as expected in the Design panel, then you may enable HTTPS.
Helpful Article: How do I publish my liveBooks site?