Hi, welcome to Stephen Wiki! Thanks for your edit to the 5 Copies of Earthbound (Day 1003 - 8/23/12) page.
There should be a tab at the right of the screen when you are editing a page; just click the video button under "Add features and media" and enter the URL of the video you want to add.
The problem with the Vlog pages was that they all had the wrong video and a caption that said that you didn't know how to add a video. They could be restored if you want to correct your mistakes.