Major Issue with the Branding plugin

Hello there,

Got a issue with the Ultimate Branding pluging. Installed it and enabled 2 options:

1. Widgets
2. Help Content

When I was editing the Help Content function after clicking on that Tab I tried to make a hyperlink to our external knowledge base UserVoice.

I guess that I made a typo because the whole WordPress editing screen is gone. Only the sidebar is visible.

Screenshot: http://www.screencast.com/t/rnKzb9KqzM5

How can I correct this?

Best, Rogier