1:- Park car on level ground and remove dip stick, It is best to do this warm but doing it cold is a lot better than not doing it at all (Note, the dipstick may be in a different place on your model)
2:- Clean dipstick thoroughly.
3:- Re insert dip stick in tube, push fully home and then withdraw and check the oil level.
4:- Clean dipstick again and repeat stages 2 and 3, making sure that the second reading is the same as the first. If the reading is not the same repeat the process again until you get a consistent reading, then top up as required, the area between minimum and maximum is 1 liter