How to remove a URL from your site and from Google Search
The instructions are directed at how, not when, to remove a URL error.
Please be sure you have setup up your Webmaster Tools Page before attempting to use the tools!
To remove a URL from your site, simply go to the page you want removed and send it to the trash.
Start by going to your webmaster tools page and choose DASHBOARD
Make sure you actually click on DASHBOARD just to be on the very first page,
Choose the box below from the bottom left
Push on those arrows after CRAWL SITE