You can find your Twitch stream key in your account's stream settings.
If someone gets your Twitch stream key, you should reset it, change your password, and enable 2FA.
In the Stream Key & Preferences section, locate the Primary Stream key option and click Copy on the right.
In the Stream Key & Preferences section, locate the Primary Stream key option and click the Reset button on the right.
Streaming with Twitch StudioIf you regularly stream on Twitch, you're new to the platform, or don't want the hassle of setting up a Twitch stream on another app, you can download Twitch Studio.