To trim a video in YouTube Studio, follow these steps: Go to YouTube Studio 1.Find the video that you want to edit and click on it 2.Click on the "Editor" button 3.Use the trimming tools to select the start and end points of the section you want to keep 4.Preview your changes and save your work when you are satisfied with the result. The 3 most important information: >Go to YouTube Studio >Click on the "Editor" button for the desired video >Use the trimming tools to select start/end points and preview/save changes