Please Help!!!

Hello , please help me i want to learn the fly glitch in Mutation mode what do i do, so far i crouch walk into my freind till we inside ea then i move to the right and we jump cntr jump. It didnt work what do i do for all the fly glitches please give me instructions

do what u did nut move back before u move to the right and hold shift when u move back so u dont go out of eachother