DNS??? browser shows IP intead of my domain name
 

I'm brand new a Linux, but I've managed to install Fedora, Apache, & Sendmail on a old P3 I had. I'm up and hosting sites and sending/recieving emails. PHP and Perl are installed and working. But I think I have a DNS problem because when someone types in my domain name they get my webpage but the title bar in the browser shows My IP address instead of my domain name. My Pri/Sec DNS is YDNS1.yahoo.com and YDNS2.yahoo.com
I have that pointing to my router and then using port forwarding to get to my server. My DNS is installed and running, but I don't have any records in it. not sure what, if anything, i need to put in it.

Any help would be great!
Thanks:study:

if your computer has a hostname, try editing /etc/hosts
to associate your ip address with your hostname.
maybe.
I don't know.