This should probably be in the Missions Sub-Forum here, but I'll answer anyway

(I don't make it into the main forum that often anymore)
We request that GMs report the results on the forums linked above so that, if it's provided early enough, we can take the results into account for future Missions adventures. if you don't report, you can't impact future plotlines

Also, ONLY the GM needs to report (And there's a blurb at the front of each Mission about that).
However, this is not required. It's purely a voluntary thing by GMs. There are only two things you and your players
need to do to maintain an official game: Follow the Missions rules in the FAQ, and be sure your players fill out and keep the debriefing logs. This allows the characters to be played at conventions or any other Missions game out there.
Have fun, and post up any questions here or over on the official forums. I'm a little slow to answer sometimes, but I do my best. And we have a fair number of regular GMs and players around who can answer most questions before I can anyway

Bull