Insert the dipstick back into the hole. Press it all the way in, then remove it.

There should be a thin layer of oil up to the bump on the dipstick labeled "MAX."

The bump indicates the maximum amount of oil that should be in the tank while the twist at the end indicates the minimum amount. Anywhere in the cross-hatched middle area is sufficient.

After checking if the oil level is too high or too low, you can add or remove oil accordingly.