How do I remove the agitator in a Hoover 500MD machine?

there are many models most common one has a bolt located at the bottom of the inside of the agitator remove cap to see it you will need several extensions,10mm socket and ratchet

as both machines are made by electrolux factory, it is a possibility
check the overhaul lengths and the method of fitment

if it is a top loader machine with an agitator that stands up in the center of the tub, try removing the dispenser and lint trap from the center ( normally just a pull up) and right down the bottom there is a 10 or 12 mm bolt that you undo and that allows you to pull the agitator up off the drive shaft
talk with a service agent as to how to get the agitator out or down load a workshop manual from google by typing in --workshop manual for hoover model 201m washing machine -- and if there is a pdf version then down load it

remove the bolt in the centre of the agitator, usually a 10mm socket and extensions to do it and pull out

my does everything but it just wont spin drye

try a 10mm socket or 7/16 socket

There can be many reasons why the machine does not agitate. If it does not complete the cycle, then it can be a problem with the timer control, see The cycle doesn't advance .
If cycle goes on, but does not agitate, it can be the agitator and more, see It doesn't agitate or There's no delicate or regular spin or agitate

take the cap of the top of the agitator you need a 10mm socket
on along extension bar undo the bolt in the bottom of the agitator and it will lift out replace by do-ing the reverse process
i have just done it better than paying $100.00 for a service call
for five minutes work

there should be a plug on the top of the agitator. pry off this cap with a screwdriver. you will see the hex nut that fastens the agitator. remove the hex nut and lift the agitator from the transmission shaft. Installation is the reverse of removal.

thank you for your prompt responce i did ring a local repair shop who was very helpfull and explained how to remove the agitator and put it back in . again thank you