How do i change the oil on a 1995 kawasaki ninja ex250?

when you see the velly of the bike, you could find big hole cap which is oil filter. Take it off and replace it. Next to the cap, there is a bolt same size as the cap bolt which is oil tank cap bolt. When you screw the bolt, the oil will plow out. Let it plow until done. Put the bolt back when it empty. Right side of the bike and middle of the foot fade, you could find a refill cap. Replace oil until the oil fill up enough. Back side of foot fade, There is a oil check. Between full and poor would be fine.