If I would like to change a URL....

If I would like to change a URL how should I go about doing that? I know we aren't suppose to resubmit so should I fill out a special form?

Simply navigate to the category within which your present URL is listed and select the 'update URL' option at the top of the page.

If you are changing the URL (domain name) itself as opposed to the description or title you should also consider adding a redirect from the old location to the new one so as the reviewing editor can clearly verify the change.