Configuring openfire server

i have installed and created an openfire database but i cant connect to it from my app.when i login to my admin panel i see this message "dns configuration appears to be missing or incorrect " please how can i resolve this?

If you don’t have network administration experience, it can be tough. You can read this example to get the basics of Openfire setup. It also mentions DNS. http://www.wroot.lt/wp/technology/very-basic-openfire-spark-guide-en/