By default, the password is 0. You can call the office to have this changed or change by going to, Menu > Settings > Users > Edit > type old password > then add your new password. Be sure to hit Submit when done to save settings.
On your remote that came with the cable box, push the “STB” button at the top of the remote then channel up or channel down. Remember the STB button on the remote should flash red when pushing a button to control the cable box.
Make sure the cable box is powered on, as indicated with a blue or green light. If so, your television is on the wrong input. Use your remote that came with your television using the Input or Video Source button to select correct input that your cable box is connected to.