How do I edit my /etc/httpd/conf.d/phpmyadmin.conf file?
 

How do I edit my /etc/httpd/conf.d/phpmyadmin.conf file?

Generally with a text editor such as nano, vi, or emacs. If you have a graphical interface, you can also use something like kate or gedit.

Since you don't state what you're trying to accomplish or what distro you're using, it's hard to give more details than this,