To get to Nova Friburgo from Rio de Janeiro you can take a bus from the Novo Rio Terminal to the Nova Friburgo bus terminal, which takes approximately 2 hours and 30 minutes.
It can also be reached by car from Rio de Janeiro, taking highway BR-101 towards the city of Nova Friburgo.
Another option is to take a flight to the Rio de Janeiro International Airport and from there rent a car or take a bus to Nova Friburgo.
See more about the history of Nova Friburgo
