From the manual:
...check the level only when the engine has cooled.
Place the motor in a vertical position...
Pull out the dipstick and wipe oil off with a clean cloth...
Insert dipstick all the way into the engine, then remove it again...
The oil on the stick should be between the upper and lower limits...
(Not from manual - the limits are two holes in the dipstick; try looking against a light-coloured background.)