irulehyrule

hi im new but the main reason i started an account on here was to see if any other brony could help me: i think theres another pony that i cant find, shes a robot horse, no cutie mark, a rainbow mane and tail, and lastly shes a unicorn. if any of you bronys know who she is PLEASE HELP!!

im so confused i have no idea how this works i mean i know that you have to post pics, but where? and how? this is not like facebook at all so could somepony please help? i would be very grateful