So i just go my Anet A8 and just finished building it and i plugged everything and i really don’t understand why when i move my bed which is moved by the x motor, my right side y motor move too and when i tried to home all axes my bed went foward and didnt stop and my y motor when up at the same time.
It’s a very small board that you purchase separately and install between the motor and main board that are meant to "smooth"the signal before it reaches the motor. Look at this on eBay http://www.ebay.com/itm/182519159031 7
The motor under your bed is the Y motor. Your Z motors are the ones on the right and left of the bed that have the spiral rods attached to them. Your X motor is the one that moves up and down the left Z axis. Your extruder is the E motor.
Make sure these are plugged into the right spots on your board, then try again.