Hi, what year is your ML?
Can you post the vin # XXXXX me?
2002 is the year vin no 4jgab75e72a331677
You have the 722.6 transmission
There is no transmission dipstick on your car. You will need the Mercedes dipstick tool to check the fluid level.
The level is checked and the fluid is added through the dipstick tube located at the right rear of the motor.
You must use only the Mercedes fluid for the 722.6 transmission.
I recommend purchasing the fluid from the Mercedes dealer but you may be able to find it in an aftermarket brand.
Let me know if you need anything else.