Add variable called current frame set it 0 on start. Add new event mouse -> mouse wheal down, add action to the event sprite -> set animation frame = frame(global variable), another action system -> add to -> frame -> 1.
Also see how many frames the animation has and add event to reset the variable frame to 0, when the last frame is reached.
You can change this event with mouse while up, and decrement the frame by -1, so with mouse while down it will scroll the animation forward, and with mouse wheal down it will decrement them.