you could hook your device to any of the ports Those are just HDMI port labels to which you could point to your TV input accordingly ( input menu through TV button or remote) : example:
- you have your computer hooked through HDMI cable to your TV HDMI 3 port : in order to display your computer desktop you have to navigate or toggle your TV display input onto HDMI 3 ( through the TV menu)
- You could have another device attached to HDMI 2, and switch between 2 devices on the fly
- What happened to HDMI 1
? was it skipped or maybe it's recessed somewhere on your TV? what TV model is it ?