Any techies know why I can’t put a widget on the sidebar of my blog here?  How do I make the widget work or can I?

I’ve tried the YouTube video help route and while I see that I can change my settings to select link or text, that isn’t really helping. This is the code that I have:
<script src=’′></script&gt;

This post is probably a call in the wilderness, but maybe someone knows something I don’t – is there a theme to use? Or a way to change the code that would help?