Like you have an address but want to set it up to your computer permanently? Are you running Windows? This Hawking-talk-alike made a spiffy video:
---------- Post added at 12:05 AM ---------- Previous post was at 12:01 AM ----------
Also, whether you're familiar with command prompt or not, you should be able to acquire a new IP address (if this is what you were requesting) by (you need an account to see links).