Creating a new tab on an EasySocial Group

Hi there,

We're trying to add a new tab to the certain EasySocial Groups. So far I have found where to overide and create a new tab in themes:
~/helpers/cover/navigation.php
I'm not too sure where my code for the content of the tab would go though.

Is there a better way to do this though, such as creating a custom field? If so is there a good template to use to create my own?

Thanks for any help you can provide,

James