[simalert]

If you don't want it at all, you can remove the postbit and legacy postbit code and the icon won't show then. This means that no one can see it.

If you want it there for mods only then I presume it's a case of using the IF command to check which group the user's in. I'm not sure how do to that, but you could take a look at the code around it to see how any moderator only options are dealt with and then apply it to the code for this icon.