Moonlight:

Fender

Bender 

 Moonlight:

sil

I need to remind you that you have to change one letter, not three

 Northern raveller:

Silent

Nilent

 Northern raveller:

I need to remind you that you have to change one letter, not three

I didnt change three i just shorten the word.

I am just reminding you that according to the rules of the game, you can not shorten the word with three letters at the same time, you have to do it one by one.  By the way, it is not rude to warn someone about the rules of the game.