How do I change my broadcast title and game name?

Note: Now, all users (free and paid) can change their broadcast title and game name.

Open the XSplit Gamecaster Overlay by pressing [Ctrl] + [Tab] (or the hotkey you assigned to it) and hover over the Twitch logo and click on the gear icon:

Then type in your desired broadcast title and game name and click OK:

When you start broadcasting, it will show your new title and game name.