If you don't see your article on the dashboard use the search box on the top right. There are 2 ways to find an article:
by the URL - simply paste the link to the search bar and click "enter"
by the title - you can paste the whole title into the search bar or type several words from it
Make sure you have selected the timeframe when this article already existed.
For example you have May 1 - May 30 selected in the calendar, while the needed article was published on June, 1.
And vice versa. A very old article might not appear in the search results if you have chosen ‘Today’ in the calendar, because it does not have any pageviews today.