Ok, for a quick example.

Mugen might come up with an error on a character mentioning something about displaytoclipboard. So you will need to open the character's CNS files and null the offending state(s).

Code:
[State -2, 1]
type = DisplayToClipboard
trigger1 = 1
text = "vel(%f,%f) Pos(%f,%f)"
params = Vel X,Vel Y,ScreenPos X,ScreenPos Y
ignorehitpause = 1
Here's a nice example of working one, but if I want to get rid of it, I'd just null it like this:

Code:
[State -2, 1]
type = null;DisplayToClipboard
trigger1 = 1
text = "vel(%f,%f) Pos(%f,%f)"
params = Vel X,Vel Y,ScreenPos X,ScreenPos Y
ignorehitpause = 1
The semi-colon is a comment marker. Any time I make a modification like this, I like to leave the original data commented out so that I know what I did. type=null just tells mugen to ignore the entire state, so if there were a problem, it would now be fixed.