I didn't see anything relating to that, what you see in my screenshot above is 2 screenshots stitched together, with the bototm half being what you see after clicking "ConsularSection instructed me to send more documents". I presume that's where you go to start the process of sending more documents to them.
I would expect to see further instructions related to couriers after writing in the box and clicking "Send request" - but I'm just guessing, for all I know the embassy then needs to process it before you get to that stage.
What I'm trying to work out is if I'm allowed to fill out that box and begin the process of sending them more documents, OR if I need to wait for them to send me an email with instructions of hat to do first.
The guy who interviewed me gave me the form which has instructions, but he also mentioned to me that I should get an email in a day or two (it's been 4 days now but that includes the weekend).
I wish I'd have asked him at the time if I could just use the form he gave me as the instructions as I suspect the automated email will just say the same as the form, but I'm not sure.