flashing my mogul to sprint!!!

ok so i got rid of gettro pcs and got sprint. now i want to flash my beloved mogul to sprint but cannot find any of the setting's needed. i know its a pain to get them to accept the esn, i just want to flash it over first then worry about the rest later. by the way i know someone will ask so yes it is unlocked. fully, radio and all. ive got the newest radio on it right now it has metro. ive been looking around but cannot find any setting to go to sprint. it originally was a qwest phone. if anybody can show me the way i will be eternally grateful.