problem with building android game

Hi all unity users.

I want to build a android game that i made, but when it's in progress to build it. it says: trying to detect the Android SDK installation folder. But i don't know were i can find it. Is there someone can tell me please?

Were can i find the Android SDK folder?

i'm using Microsoft windows

I'm in the midst of figuring all this out myself but If you don't get any other answers start here: Setup

If your like me and like visual instruction: Youtube