cp /usr/lib/firewalld/services/ssh.xml /etc/firewalld/services/

vi /etc/firewalld/services/ssh.xml

<?xml version="1.0" encoding="utf-8"?>

<service>

  <short>SSH</short>

  <description>Secure Shell (SSH) is a protocol for logging into and executing commands on remote machines. It provides secure encrypted communications. If you plan on accessing your machine remotely via SSH over a firewalled interface, enable this option. You need the openssh-server package installed for this option to be useful.</description>

  <port protocol="tcp" port="10022"/>

</service>