How do i change th registered name on my computer?

i have a dell xps. and my cuz without my knowing it, he changed the registration name on my computer. soim wanting to change it back.How do i change th registered name on my computer?
click on start click on computer and then click on system properties and then click on advance system settings



or click the pearl and type advance SYSTEM properties in the search boxHow do i change th registered name on my computer?
all i no is that u can usually go to the search box and type in keywords, i.e. change registration name, and it will bring it up.
http://www.wikihow.com/Change-the-Regist鈥?/a>
open start and right click my computer, then propieties then computer name tab...done reset it .