urgent query - submitted application, how to add details?

[hellothere77]

I have applied online for out of country application and booked an appointment on sept 17 th.

Now I plan to travel to UK again to take my last exam for my MSc (currently on tier 4 visa)
in the visa application I forgot to state the additional dates of this travel to the UK (sept 9 - sept 16th) although I am not even sure I could state that trip as as of that date it would ve been in the future. I have stated the overall trip - when i came first day for my masters and when i left london in late august.

Is it necessary to state the details of the trip as the trip is AFTER the date of the application completion, and if yesm how can I add the details?

I would appreciate anyones opinion on that, i am now so nervous about this upcoming trip!