If you're the CO of the squad, just have the nose art file named with your game id and put it in your ah2\squads folder (look in there to see everyone else's).
Go online and enter the O'Club/Squad area and "upload nose art". That's it.
Once Skuzzy processes it, everyone else in your squad will download it and apply it to their airplanes automatically. It will also "just show up" on the squad pages on the HTC website.