For pictures, like this wise looking monkey go to the top of your tool bar and choose “Upload/Insert, Add media.” This will bring up a menu that allows you to choose pictures from various sources.
This is an embedded video. “Ridiculous!” I hear you say. And fair enough too. With WordPress all you need to do to embed a video is find the URL ( The gibberish in the address bar at the top and copy/paste. When you or the public view your page it should come up as the video not the URL.