:| I'm terribly sorry, Areku! I guess I was in the wrong thread with that reply.
But, in hopes of answering your question and making up for my carelessness - try this:
Admin CP > vBulletin Options > Edit Options > and change the settings accordingly.
If you want members to have "edited by ..." shown, but NOT admin - check "yes" and "no" respectively for the first two options in "Edit Options". If you want neither to show - check no. And so forth.
:banana: