Find the video you want to put on the website. Once you find it, press share on the video.
You will press embed. You will get a pop up. On that pop up, you will press copy.
With that code copied onto your computer's clipboard, you are going to go to your html code. You will either press "ctrl+alt+v" or you will right click and press paste.
View your website in a browser and there it shall be.