Have to have the top up, thenremove the boot cover ,thats the cover thatgoes across behind the the rear seat, under that you will see the top motor it has a rubber plug at one end,remove it ,but have ready a bottle of transmission oil with a plastic hose so you can squeeze it in until fill, While you are there check all the hoses you may find one loose or bad , or you will find that there is oil laying under one of your cylinders that will be the one that has let the oil out so will need replacing or rebuild,but by filling will work for a while .