Begin by uploading your video to YouTube. Once the video has been uploaded, view the page for the video, then click the "Share" link, located below the video itself. Next, click the "Embed" option, then highlight and copy the supplied code.
Once you have the embed code copied, return to HillTopand begin creating a new post. In the "Content" section, click the "HTML" button, located on the far right hand side of the third row of the toolbar. Paste in the embed code you copied earlier, then click the "Update" buton at the bottom of the "HTML Source" window (the code can be pasted above or below any existing content).
A thumbnail/preview of the video should now appear in the Content field. After embedding the video, continue creating the post as you would normally.