Where is Dipstick and Refill point/ location for transmission fluid on LDV ?

Where is Dipstick and Refill point/ location for transmission fluid on LDV Convoy 2000 Diesel 2.5 LT.

Hi.
Difficulty shifting into 2nd gear.
I’m having an issue with my 2000 LDV Convoy (Banana engine 2.5Lt) Its hard to shift into 2nd gear from 1st gear, Like it doesn't want to go in. I have to try 2-3 times to shift into 2nd gear, most of the time when I try to shift from 1st to 2nd gear it goes into neutral But all the other gears shift perfectly fine.

So I thought first I would like to try to change the transmission fluid and see if the problem will be gone, I know where the transmission drain plug is, But the problem is I can’t find the Dipstick and Refill point/location.

Thanks in advance.
Roberto.