Jetway repainting

[ooOO00OOoo]

I have done a basic repaint on jfkjetway and named it wgn jetways. My question is can this type of repaint be done in fsx? Do i need to edit a flie? I just want my wellington to be as real as possible without buy RNZW(although i do want it)


Sorry abou all these questions i have been asking, as you have probaby quesed i got this on boxing day so i'm pretty new to editing.