Where is the setting to turn on activating Google now Ny voice?

[semp1]

Just by saying Google activating it where is this setting?

Posted via My Developer's Edition HTC one

 

[Aquila]

Just by saying Google activating it where is this setting?

Posted via My Developer's Edition HTC one

It works when you're in the app, if you say, "Google" it activates the voice search function. To make sure it's on, go to settings>voice and it's "Hotword detection".