On the top of the coffee machine, there is a dial this is the grinder dial.
It controls how the fine or coarse grinder grinds the beans.
If you turn the grinder clockwise so the dot is at the smallest part of the line, this will grind the finest. Turn it this way if you like a strong brew, the finer the grind the stronger the brew!
If you turn the grinder anti-clockwise so the dot is at the largest part of the line, this will grind the coarsest (large and chunky). Turn this way if you like a weak brew.