Create a .htaccess file then write this code you will redirect all HTTP traffic to HTTPS.
##Global Http to Https Redirect RewriteEngine On RewriteCond %{HTTPS} off RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [R,L]
If you want a single page to redirect http to https then use this code.
## single page redirect RewriteEngine On RewriteRule ^redirect-http-to-https-page\.html$ https://www.example.com/redirect-http-to-https-page.html [R=301,L]