How to use Secure Delete function?

I am trying to use the Secure Delete function by opting for the delete icon in the Toolbar referenced by "MMB: Overwrites selected up...".

I have, within Preferences, the option checked to use Secure Delete and set the number of wipes appropriately. However, when I highlight the folder/file(s), the icon does nothing but display, what appears to be, a butterfly with a blue flame?. Not sure if that is what it is but that is how it appears to me.

Update: Found the fix.

Any help appreciated,