Sorry was not clear, I fully understand how to purchase and use the pre existing apps.
I am talking about REQUESTING a new app, your link show's that users have to go to the OBD11 Forum page, my point is we see lots of people just raising request along the lines of can we have an app for x or y but with no coding details.
Others as per the instructions provide the full coding details and they in my experience are much more likely to get built.