To add videos as admin, edit the HTML code directly.

Example video block you can copy/paste:

<div class="video-container">
    <div class="video-wrapper">
        <iframe width="560" height="315" 
            src="https://www.youtube.com/embed/YOUR_VIDEO_ID" 
            frameborder="0" allowfullscreen></iframe>
    </div>
    <div class="video-info">
        <h1>Your Video Title</h1>
        <div class="video-meta">
            <span>0 views</span>
            <span>• Posted by Admin</span>
        </div>
    </div>
</div>