Google’s Chromecast is a handy, inexpensive way to stream media from online to your HDTV using your computer or mobile device as a bridge. It uses your home Wi-Fi network and works with certain specific kinds of online content and Web sites. It’s not as simple as plugging it in, though; it also needs to be told what Wi-Fi network to use and what password to enter first. That’s where this guide comes in. Depending on whether you use Android, iOS, or Chrome on a Mac or PC, the Chromecast setup process can vary slightly, but overall it’s pretty straightforward. Once you get going it’s a very direct system, but this guide will walk you through each step, so you can get everything working properly on the first try.