How do I start using my remote (out of the box)?

Refer the following instructions.

1. You need to pair your remote with the Set-Top-Box.
2. Make sure the remote batteries (AA) are installed and your TV and Xfinity X1 TV Box are powered on. Also, set the TV input to correspond with your Xfinity X1 TV Box.
3. Press and hold the Xfinity and Info(i) buttons together for five seconds. Wait for the remote light to change from red to green. Follow the instructions by entering the three-digit, TV on-screen pairing code.
4. Once your remote is paired, follow the TV on-screen instructions to set up control for your TV and audio device.