after install powerdns as http://teguhth.blogspot.com/2019/08/how-to-install-powerdns-and-poweradmin.html now install poweradmin
1. Installing PowerAdmin to Manage PowerDNS
[root@powerdns-teguht ~]# yum -y install httpd php php-devel php-gd php-imap php-ldap php-mysql php-odbc php-pear php-xml php-xmlrpc php-mbstring php-mcrypt php-mhash gettext
2. Install additonal package
[root@powerdns-teguht ~]# yum -y install php-pear-DB php-pear-MDB2-Driver-mysqli