To connect Philips Hue to your Alexa, you will need the latest version of the Hue app and a Hue Bridge v2 (square-shaped). Your Alexa device must be connected to the same Wi-Fi network as your Hue Bridge. Enable the Hue skill in your Alexa app. If you do not have a Hue account, you will be required to create one. Follow the prompts to complete the setup.
Once the device is connected, ask Alexa to "discover devices" or select "Discover" in the Alexa app. This will display all of your lights, Rooms, and scenes. After a successful pairing, you can control your lights with your voice.