I don't think you've explained yourself very well.
With no-ip, you download a program which sits on your computer. This program updates the no-ip site with your IP address, thus allowing you to use a DNS address which always directs to your IP, no matter what it is.
1. Setup no-ip with an appropriate address (shinobi.myftp.org for example)
2. Download their update client and run it
3. In your router, forward Port 80 to the LAN IP of the computer its on.
4. Done
/Leo