I just figured out what happened as I was testing it out for you and then edited your post to include the embedded video — So it looks like the original code you had wasn't the embed code. So when go to the video in photobucket. there are several code options to the right to choose from — make sure to copy the HTML code (usually it will have the words embed in the first part of the code.) Then when you come back here, click on the "source" icon in the tool bar, and that will bring up the html version of your text — then paste the code. It may also work without having to the icon, but if it doesn't then that's the next step. We also have a new tool that is supposed to helps you (the photo/film icon) embed video — but I just tested it out and it's not working. We just uploaded this new text editor and it needs to be adjusted — I may also have to change the instructions as the text editor has changed a bit.
Note: sometimes after you embed a video, the space will be blank and you just have to push F5 and it will show up. (That wasn't what was happening with you as the code just wasn't right, but I'm just letting others know that even when you do it have the correct code, don't be alarmed if it doesn't show up and only a blank space is there. Refreshing the page should make it show up if it was done correctly.