You'll need a phone, tablet, or laptop computer to set up Chromecast. You can set up Chromecast by first navigating to cast.google.com/chromecast/setup. Tell us a little more about where you're having trouble:

I can't connect to the Wi-Fi network that I'm selecting

I don't see my Wi-Fi network listed during setup

I don't see my Chromecast listed in the Google Home setup app

I'm having trouble physically connecting my Chromecast

I don't see the Chromecast home screen on my TV

I'm seeing a yellow exclamation mark error screen on my Chromecast

I'm having trouble setting up Chromecast with my Samsung device