As a noun:
* The newspaper's editorial criticized the mayor's handling of the budget.
* The magazine's editorial board met to discuss the upcoming issue's theme.
* I read the editorial in the newspaper to understand the editor's opinion.
As an adjective:
* The newspaper published an editorial cartoon about the current political climate.
* The magazine's editorial calendar is filled with interesting features and interviews.
* The writer's editorial voice was clear and concise.
In a phrase:
* The journalist wrote an editorial piece about the importance of voting.
* The author expressed his editorial opinion in the preface.
* The website's editorial content is informative and engaging.
Remember that "editorial" can refer to both the opinion piece itself and the process of editing.