How To Track 404 Not Found Errors With Clicky?

I want to track / know when a user gets a 404 error using Clicky.

How do you do that? Thanks.

you will see a page not found under the content tab in your dashboard, or add your site to webmaster tools which should be checked often.

found this old clicky forum post https://clicky.com/forums/?id=382
evidently he put 404 in the page title and then filtered results in content

thoughts on this? any other approach?