Blux provides automatic free SSL certificates for your domains though Let's Encrypt
. Once you add your domains to your site in the settings screen and update your domain DNS settings to point to blux you can enable SSL by clicking on the "CREATE/RENEW BLUX SSL" button in settings > domains. Once this is set the renewal of the certificates with your domains will be automatic. You can use this button to generate new certificates if you add domains to your site.