Drain plug location

New motorcycle engine oil (as per manufacturer's recommendation)
Oil filter
Wrench or socket set
Oil drain pan
Funnel
Shop rags or towels
Prepare the Motorcycle:
Ensure the motorcycle is on a level surface and turned off.
Allow the engine to cool down if it has been running.
Locate Drain Plug and Oil Filter:
Identify the oil drain plug underneath the motorcycle engine. It might be covered by a skid plate or other protective cover.
Find the oil filter. It's usually located on the side of the engine.
Drain the Old Oil:
Place the oil drain pan underneath the drain plug.
Use a wrench to carefully loosen the drain plug (anticlockwise). Let the old oil drain completely into the pan.
Once drained, re-tighten the drain plug securely.
Replace the Oil Filter:
Use an appropriate tool to remove the old oil filter. Be ready for some additional oil to drain out.
Apply a thin layer of new oil to the rubber gasket on the new oil filter.
Install the new oil filter and tighten it according to the manufacturer's instructions.
Refill with New Oil:
Locate the oil filler cap, usually on the side of the motorcycle's engine.
Use a funnel to pour the recommended amount of new motorcycle engine oil into the oil tank.
Check Oil Level:

The OEM manufacturer did not install a drain plug in the transmission pan of the vehicle. You must drop the pan to drain the fluid. This is normal as you usually service the filter when you drain and fill the transmission.

There is no radiator drain plug on these trucks, you have to remove the lower radiator hose to drain coolant.

Found this on wiki answers

There is no dipstick on the Malibu transmission. To correctly check fluid level, you must locate the filler cap and the drain plug on the transmission. The filler cap is a red cap located on the drivers side of the transmission between the air filter box and exhaust crossover pipe, almost under the crossover pipe. The drain plug is located on the passengers side of the transmission, just behind where the axle connects to the transmission. It has an 11mm head and can be seen if you lay in front of the passengers front tire, look about 3 inches above the transmission pan. Once you have located these, warm the transmission to normal operating temperature, and with the car running, transmission in park, and the car sitting level, slowley remove the drain plug, have a drain pan under the plug in case any fluid comes out. There should be very little fluid coming out, if there is none coming out re-install the plug, remove the filler cap and put 1/2 quart of fluid in, now run the transmission thru all the gears and back to park. Put the drain pan under the plug and remove the plug, if it is overfull, let it drain until it stops, if it still doesn't have fluid coming out, add 1/2 quart at a time until it does, following the above procedure. Make sure you let any excess fluid drain out and re-install the plug. As noted above, make sure the car is running while checking the fluid. I know it seems complicated but it isn't as bad as it sounds. This same procedure applies to all Chevy Malibus from about 1997 until 2004 if I'm not mistaken.

Depending on the manufacture some come with oil filters and some without. There exists on all machines a drain plug located on or near the bottom of the crankcase housing. Use a suitable container to catch the drain oil ( 1 gallon drain pan ) . Drain the oil completely from the crankcase some drain plugs contain a magnet to catch particles clean it off prior to reinstalling it, reinstall the drain plug. Locate and remove the oil filter making sure the old oil filter base gasket comes off with the old filter, install a new oil filter as described by the manufacture. Then refill the crankcase with the proper mount of new engine oil through the filler plug/ dipstick hole.

I suggest you read your owners manual and get acquainted with your motorcycle. The engine oil drain plug & the transmission drain plug is something you should know. One is a 5/8 hex head vertical plug and the other is a horizontal plug.....The engine oil drain hex bolt is located on the right side of the motorcycle and is removed/installed horizontally.
Transmission oil drain hex bolt is located on the left side of the motorcycle and is removed/installed vertically.

I am referring to the drain pan on the Harley Davidson Twin cam 88 engine.

The engine oil drain hex bolt is located on the right side of the motorcycle (as you are seated on it) and is removed/installed horizontally.

Transmission oil drain hex bolt is located on the left side of the motorcycle (as you are seated on it) and is removed/installed vertically.

Side of the engine has a counter sink screw that is a drain plug & THE LOWER RADIATOR HOSE OR A PETCOCK IF ONE IS INSTALLED

The tranny fluid is added through the tranny dipstick (make sure it's not the oil dipstick). Fluid color should be red and the dipstick should have instructions on how to check level (car in park, engine at idle). Funnels are your friend here.

Find the oil drain plug, remove, drain the oil into a pan, reinstall the drain plug a tighten, locate the oil filter and remove, check mounting surface to make sure the old gasket didn't stick. Coat the new filter gasket with oil and install hand tight. Refill the oil, make sure that you do not overfill. Start enigne for about a minute, shut off and double check the level, and that the filter and drain plug do not leak.
Some engines can be difficult, to identify the location of the drain plug and filter. There are thousands of configurations out there, If you are not familiar or can not locate the plug and filter, take the vehicle to a shop for service.