Unfortunately, there is currently an issue with Facebook that prevents us from supporting editing for streams on Facebook groups. To make any changes to the title, description, or thumbnail of your stream, you will need to do so directly on Facebook. Here's how:

1. Go to the upcoming event on Facebook.

2. You can access this event from your Upcoming streams dashboard by clicking the the groups icon:

3. It will open Live Producer, from this screen copy the event url and open it in a browser:

4. This is the event page. Now click on Edit:

5. On the event page you can change all the event details, like title, description and upload new thumbnail.