Once Plesk is open, click on "SSL/TLS Certificates" under "Files & Databases"
Click "Install" to install a free Let's Encrypt SSL certificate.
Enter your email address in the provided field. The SSL certificate will be automatically renewed every 90 days, and you will receive notifications at the email address you provide here.
Check the first and third options if you are requesting an SSL certificate for your primary domain.
Only check the first option if you are requesting an SSL certificate for a subdomain.
Click "Get for Free". The SSL certificate is now activated for the specified domain.
