|MS paint is default with XP and you should at least know the basic tools it uses,, if you find mspaint "Start Menu\Programs\Accessories\paint "then you a face with a window like below scroll over things to understand what they are and you will see

select= to crop around a image
freeform =to mask a poly line around a image
pick colour = pretty self explain but you can pick on a photo colour and then pick a tool like paint bucket =to drop colour in a selected area .or in your case you would be using fsrepaint and you would take a cropped copy of a emblem to stick on the tail by using the select tool /cropping around image part you want and press /ctrl+C "copy" and then clicking into your fsrepaint window and pressing ctrl+V "paste"EDIT in fspaint window you would click up in the file or edit/and select paste into the textures in fsrepaint .. ctrl+Z is undo"detele your last move "
its going to be alittle while before you gain it as a art but it will happen if you stick at it, these are the same tools in fsrepaint as well and if you have a good read of the readme or click on help it will explain a whole heap more
goggle search on tutorial on how to use mspaint even a you tube movie ?
this is a hard one to teach over the net and is trial and error for you but it is a great tool and you will be making fleets in no time