i have a problem with my heli-max axe cp. it wont seem to take off it seems like the negative pitch and positive pitch is reversed

for example: everytime time i pish up on the collective stick it gives me negative pitch and everytime i psh down on the collective stick it gives me positive pitch. i know i could fix it if i had a spectrum radio or computer proggrammed radio acoording to the guy at the hobby shop said, but i dont have one, i have the standerd radio from heli-max. PLEASE HELP!! I JUST WANT TO FLY!! ahah