you need to check it when Warm ..so, run the engine lift the hood & then cycle the gear shift from "P" to "1" & back again (Leaving it in "P") then check yer dip stick.
If it requires Oil then buy some AFT Oil (Auto Transmission Fluid) & top up as necessary down the Dip stick hole.
Last time I checked mine I put nearly 3 litres in it !!!




Gear shiftin was MUCH smoother after that !!!