To secure transactions with your site by useing SSL/TLS protocol, perform the following steps:
1 - Install an SSL/TLS certificate on the site.
2 - 1 - Logged in to Plesk, https://your domain name:8443.
3 - Go to Websites & Domains.
4 - Click Hosting Settings below the site's name at Websites & Domains.
5 - Switch on below.
- SSL/TLS support.
- Permanent SEO-safe 301 redirect from HTTP to HTTPS.