so i am trying to make a personal server and i am having trouble with that

[7z_h3]

so i am trying to make a personal server and the 'space station 13 wiki' says to go to '+secret subdirectory' and make a blank file called '__secret.dme' and i dont know what any of this even means or how to do it. there are no explanation on the internet (as far as i searched) so i will be very thankful if someone can explain what to do.