On my Honda mower (which is over 20 years old) the drain plug is below the filler tube on the deck. Put the mower up on something and put a pan below the deck to catch the oil. It's not a very tidy method, but it works.
Many Honda lanwnmowers don't have an oil drain plug. Draining the oil involves removing the oil fill cap and tipping the mower on its side in a way that the fill hole is low. Be sure to have your oil catch pan already in place and a few paper towels at the ready. Work on newspaper if you'd like to avoid a mess.
There is none you suck the oil out with a pump provided by the dealer.
plug it in and push the on button
Many Yardman Lawnmower models do not have a drain plug. If no drain plug is found the oil has to be removed by the oil fill tube.
Honda 215 lawnmower
Depending on what lawnmower you have just simply take the spark plug out and tilt lawnmoer
With the engine off and the plug wire off the spark plug, you will need to remove the drain plug on the bottom of the engine. Drain the oil, install the plug and fill with 30w oil.
Your owner's manual should explain that.
The oil drain plug for the Craftsman 625 series lawnmower is located on the bottom of the mower, just above the blade. Tip the mower back. The plug is round and threaded with a square head. Using the square head of a ratchet extension, twist the plug counterclockwise and remove. The oil will start draining. Once it has drained, replace the plug and tighten clockwise until snug. Replace with new lawnmower oil or SAE-30 weight oil.
youtube - push mower oil change.... oil plug under mower deck
A bit of teflon tape can work wonders.
If it like most Honda engines, the whole engine needs to be removed from the deck to get to the drain plug. As this is not an easy task, the best way is to turn the mower on it's side (make sure you do not turn it onto the carburetor side) and drain the oil from the fill tube.
Depending on the model of the Craftsman lawnmower, there is either an oil plug underneath the deck of the mower which needs removed to drain the oil or the lawnmower needs tipped on it's side to allow the oil to drain out through the oil cap area. Once oil has drained you will want to refill the oil until the dipstick registers "full".