Login to your status page at instatus.com/login then choose your status page.
Click on the Subscribers tab, then Google Chat
Click Add a Google Chat Space,
A new form will appear where you can enter your Google Chat Webhook URL, and specify which components should this channel be notified about.
You can give a name to your integrated Google space by clicking on it and typing a name in the form, you could also delete this integration by clicking Unsubscribe.