You have to change the template POSTBIT_IP_HIDDEN
Go to your admin control panel, scroll down @ the menu on the left, there is an option Templates.

Click EDIT
Now search for the template POSTBIT_IP_HIDDEN

Replace the whole text in that box with:

2nd question , about REPORT BUTTONS
U need to edit POSTBIT template, and search for the text REPORT POST TO MODERATOR.

Replace it with a image from your images folder, so:

<img src="{imagesfolder}/REPORT*.gif" border="0">

* = u need to change REPORT.GIF with a image u want to use


Have phun with it