To set up your Chromecast, plug it into an HDMI port on your TV and then download the Google Home app on your Android or iOS device. You can then choose your Chromecast within the app and start the initial setup and connection method. Once setup, you’ll be able to use numerous apps like Netflix and YouTube to cast to your Chromecast.
STEP : 1
Insert the Chromecast into associate HDMI port on your TV.
STEP : 2
Connect the Chromecast’s USB cable to your TV or a wall adapter.If your TV includes a USB port, you could use it to power the Chromecast.Otherwise it will need to be plugged into the wall.
STEP : 3
Turn on your TV.
STEP : 4
Use the INPUT button on remote to switch to chromecast.
Here’s link to how to cast photos to TV using chromecast from iOS.