by Bus: Buy your ticket and boarding the Central Bus Station or airport. www.fretcar.com.br
By Car: Rent a car at the airport or in the center of Fortaleza, and follow the highway to the city Jijoca de Jericoacoara.
You can leave the car in a parking lot and follow the city in a pick-up D20 to the village, or hire a guide to lead them to Jeri. Jeri here in the car is useless, because everything is done on foot.
Find a transportation to Camocim and from there can take the bus or a pick up to get to Jeri.