You can also add a Youtube video on your website by copying the URL of the video on the Youtube site, and adding it to the 'Text & Media' element in TYPO3.
Go to the Youtube website and find the video you wish to use. Copy the URL address. (9.3.1)
Now go to your TYPO3 website and create a new element on the page where you want the video. Select 'Text & Media' under the tab 'Typical page content'. (9.3.2)
Below the tab 'Media', click 'Add media by URL' to open the fields to add the address for the Youtube video. (9.3.3)
After adding the address, the video is presented in the element.
Here you can handle the file: add a unique title (1), add a description for the video (2) and enable if the video should start playing automatically after loading page (3). You can also add 'Width' (4) and 'Height' (5) or a border (6).
Positioning and aligning the video to the text (7) is also possible. If you have added more than one video, you can also select how the videos should be placed in alignment to each other, by using columns (8). (9.3.5)