Howto Uncouple On Ntp?

Trying to run the 09:06 Class 45 Timetable Serviice from Sheffield to Leeds.
First thing that needs doing is to uncouple last 2 carriages. UI reckons I'm 4-5 yards away seemingly on top of the carriages,.

Try other side of carriages. Also 4 yards away. How do you uncouple the lsast 2 carriages?

 

You have to pixel-hunt around the couplers. Ignore the "5 yards"

 

Thanks. I see what you mean. Found it eventually on the non-platform side of the carriages.