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Double-click the PowerPoint presentation file to open it in PowerPoint. If you haven't yet created the presentation, double-click the PowerPoint app icon that resembles a white "P" on an orange background, then click Blank Presentation. Click a slide on the left side of the PowerPoint window. It's in the left side of the orange ribbon that's at the top of the PowerPoint window. Doing so will open a toolbar below the orange ribbon. This option is on the far-right side of the Insert toolbar. A drop-down menu will appear. It's in the Video drop-down menu. Doing so opens a window with various search bars. You'll find this option on the right side of the window in the middle of the page. Type in the name of the video you want to add and press Enter. If you don't have a specific video in mind, just enter a keyword instead. Click the video that you want to embed in your presentation. It's at the bottom of the window. Doing so will embed the video in your PowerPoint presentation. Click and drag the video to the place you want it on the slide, or click and drag one of the knobs in the corner of the video to enlarge the video window. It's in the middle of the orange ribbon. This will open the Playback toolbar. Click the "Start" drop-down box in the "Video Options" section, then click Automatically or On Click. Selecting Automatically will prompt the video to begin playing when the slide loads in the presentation. Press Ctrl+S to save your changes to your PowerPoint presentation. If this is a new presentation, a window where you can name your file and select a save location will pop up.
Open your PowerPoint presentation. Go to the slide on which you want to embed a video. Click the Insert tab. Click Video. Click Online Video. Click the "Search YouTube" search bar. Enter a video's name. Select your video. Click Insert. Reposition or resize your video. Click the Playback tab. Choose a playback prompt. Save your work.