You've probably already found the answer to this or given up :)
But just in case, here it goes:
-Once you install the module, by doing mouseover on the downward pointing arrow on the top left corner of the container, you get the menu of actions.
-Choose "Settings", then at the bottom of the resulting page you will be able to open the Event Module Settings node.
-Once there, open the Enrollment Settings node and you will see a filed where you can input your PayPal account

Hope this helps, it's my first contribution to the forum.
Thanks, Alan Vance for this module!