League of Legends (LoL) Question: How can i do it?

Hey, i am playing much support, and i have read a lot about it. Suddently i saw someone say: "Janna wins most games as support, if you see the statistician from mobafire" and i was i was thinking: "Hey i know mobafire! I use mobafire a lot, how do he see those statistician?" I have tried to figure out but i dont know how to find it. Can anyone tell me how i can find it?