You can also be able to set the ID,class and style attributes for that module.
It's very easy to use, just put tha code in the text areas and you will be able to do whatever you want to do:
Show advertise code, like Google Adsense
Google custom search box
Statistics code, like StatCounter or Google Analitics
Paypal or Donation box
Facebook social plugins
If you are an advanced user you can also use PHP code to create a module more functional to the website.