Are you read text on linked page ?? I read this page probably 10 times and it is not clear for me whether I should compile FW and even more unclear how to do it. Download the arduinu sketch is not difficult, but as I understand it is not enough and I need to compile FW with the Mavlink libraries?
I am asking questions on the forum, only those for which there are no answers or not clearly described in the manual, although it should be noted that the Forum answers get even harder, competent people are annoyed with simple questions. From about ten my questions on forums I got real help only at one - "Autoquad.org site in down second day. Could anybody restart it?".