If you run across an html widget you’d like to install, or any legitimate html code for that matter, and would like to install it as a Widget in WordPress, here are the steps:
1. Copy the embed code for the widget.
2. Go to your WordPress dashboard and, under Appearance, click on Widgets.
3. Drag the Text Widget to the side bar.
4. Paste the embed code into the Text Widget window, save and close.
5. The widget should now show up on your blog.