Adding Subdomain to a single page

Try a 301 redirect in your .htaccess file.

can you elaborate please?

I figured it out!

In cPanel, I went to the subdomains link and registered mpdg.mpeng.us and made sure my root folder was public_html and did not create any redirect.

Then, I downloaded the plugin https://www.ads-software.com/plugins/automatic-subdomains/ and made sure that the permalink to the page was https://mpeng.us/mpdg/ for the plugin to automate the subdomain.

please letme know too ??