How can you change the name to whom a computer should be registered to?

I recently bought a new computer.The tech registered it to the person who picked it up for me.How can I change this to register it in my name only,since I bought it and am responsible for it?How can you change the name to whom a computer should be registered to?
Right click on my computer icon%26gt;properties%26gt;advanced system settings%26gt;computer name tab and click on the ';change'; button.How can you change the name to whom a computer should be registered to?
if you are wanting to change the computer name just right click on my computer and goto the tab ';computer name';