Oh, don't be embarrassed. In this computer age it has taken me longer than most, probably, to get used to terms and then, what on earth they mean.
The URL is at the top of any page on the internet. For instance, if you wanted to look up Amazon at the top of the page you would type in www.amazon.com or on my computer I just type in amazon.com. Once you hit enter it opens the site you want to see. On the board each page you are on has its URL. Go up there with your curser and RIGHT click. A box will pop up which lists 'cut', 'copy', 'paste' and 'delete'. Click which ever one you want to use. Hope this will help you. :-D