FF6 Hacking

is there anyway that someone can create a online header and unheader site for me to use please so i can use that site incase i have to use my macbook air laptop only for awhile to play romhacks

This utility can remove and add headers on Mac OS: https://www.romhacking.net/utilities/484/

i have no idea on how to use that program at all

I don't have a Mac but it has a GUI so it shouldn't be very difficult to use. You're likely on your own for this one..