question about repainting

Hey guys..i was wondering how i create my own paint for my pmdg plane..so i downloaded the paint-kit and repainted it but now i dont know how do i make it available to use inside the simulator..i couldnt find a guide or something like that in the sticky that could explain me how to do it..if someone would give me link or explain right here it will help me very very very much... :)thank you very much