Open the search of the admin (the "Search site" button of the admin menu) and type a query. The results are posts, pages, tags and staff users.
Examples
When I search the admin for "Travel diary 3"
When I search the admin for "Guides"
When we search the admin for "Contact"
And I search the admin for "Arthur"
When I search the admin for "nothing like this"
Pattern
When(/^(?:I |we )?search the admin for "([^"]*)"$/, …)
Part of @webship-js/ghost-steps (github.com/webship/ghost-steps), a step pack for Webship-js 2.0.x.