Why you should regularly update your passwords

Mind if I ask how one does that? I use the same program but I've resigned to copy and pasting. It might not even be that beneficial for me since I only use it for mules. I have my main's 15 character random memorized and muscle-memoried into my hand, though there are situations where I resort to the mentioned method when my mind gets fuzzy.

I have it set as Ctrl + Alt + Z.