[MiiSha]

Yes, because you can't start a function {} without a header so you have to make an if statement at the beginning then make your code .. and uh.. My code didn't work because of the " if(Muted[playerid] == 1) " so you have to put it after that and use just one return, don't return both of the message and 0 .
I hope you could have fixed your problem.