HTTPS is the protocol for the transmission of data using a cryptographic SSL connection. To configure it, you need to install a digital SSL certificate.
Preparing for installation of an SSL certificate
Before uploading the certificate, you need to:
1) Change the IP address that your domain points to and modify the settings of your subdomain. 2) Disable redirects http→https and www→without the www in case they were enabled.
How to change the IP address for an A record (or 'address record') if you purchased your domain on Tilda (or received it as a bonus with our annual subscription).
Go to Domains → Domain details and settings → USE IP HTTPS.
The DNS records for your new domain name will be updated in 24 hours.
I did not use Tilda to register my domain name. How can I change the IP address for an A record?
Go to your domain registrar (such as godaddy or namecheap.com), then open the DNS, or Zone Management, menu of your hosting control panel.
1) Change the IP address for an A record to 188.8.131.52 2) Modify settings for the www subdomain. Change the IP address for an A record for www to 184.108.40.206 The DNS records for your new domain name will be updated in 24 hours.
Installing an SSL certificate
After changing the IP for the domain, disabling the redirects and waiting for 24 hours, you can generate the SSL certificate.
Go to Site Settings → SEO →HTTPS settings.
Click Manage and move toggle into ON position to generate your free Let`s Encrypt certificate
Wait for 5-30 minutes. The certificate has been connected. Your website now opens using the https certificate.