I'm having trouble changing the chat notifications for NightBonus - the original text is pretty bland ... no offence I love the plugin!

however everytime I do anything to the .cs file in the plugins folder, restart everything and look back in the folder - i get a notification telling me it's been modified by another program and asks me to save. 

Any help would be greatly appreciated!

You dont change anything in the .cs folder  or you stand a good chance of killing the plugin  :)
Although i cant see what needs to be changed as it is pretty obvious what it means,
"Nightbonus for points per hit enabled",
Anyway:
You change the chat output in the "Lang" folder , You change settings in the CONFIG zlevels config .json file and in some plugins (betterloot) you change them in the DATA folder,

thank you!