Customization of the Welcome Email?

I'm trying to do a pretty simple customization of the registration process. I did some searching but didn't find any tutorials on this

In a welcome email after account confirmation for new user accounts I would like to add some custom text adcopy, Is there a wysiwyg where I can edit this email in the easysocial admin?

Also I'd like to obviously replace the easysocial logo with my own on the email as well.

Thanks!