Dynamic IP Ubuntu 7.10 server

So i was looking at the Perfect Server 7.10 setup and i saw that it said in a few places that i had to put in an IP address. The problem is that i have a dyanmic one, but still want to have a server. I know of things such as no-ip.com and dyndns.com, etc. But where do i insert the temp domain that i get from there (e.g. test.no-ip.com) to make it work? Will this cause any problems or do i have to install anything differently?

Thanks

 

Is your server in a local network (behind a router), or is it connected directly to the internet?

 

its behind a router

 

Then you must use the system's local IP address, not the public one of your router. As hostname, you can use the one from no-ip.com.