Step 1: Plug in your Chromecast device
Plug Chromecast into your TV, then connect the USB power cable to your Chromecast. Then either plug the other end of the USB power cable into an open USB port on your TV OR into the included power adapter which you will then plug into a power outlet. Note: Only use the provided AC adapter.
Step 2: Connect your Chromecast device
Double check that the Chromecast and the mobile device, tablet, or laptop you are using to set up Chromecast with are both on the same Wi-Fi network.
Step 3: Download the Google Home app
On your mobile device, tablet, or laptop, download the Google Home app Chromecast cast icon
https://play.google.com/store/apps/details?id=com.google.android.apps.chromecast.app
Step 4: Set up Chromecast
Follow these simple Chromecast setup instructions.
https://support.google.com/chromecast/answer/2998456
Step 5: Cast content
Learn how to cast from Chrome to your TV
https://support.google.com/chromecast/topic/4602553
or cast from Chromecast-enabled apps to your TV.
https://support.google.com/chromecast/answer/3006709