How to change the logo on the site

Sorry about the basic questions, I'm new to Joomla and Easy Social, so I;m struggling a little

How do I change the main title/logo of the site? I have loaded a logo in the back end, but that only appears on the emails that go out. http://thehuntingnoticeboard.temporarywebsiteaddress.com/administrator/index.php?option=com_easysocial&;view=settings&layout=form&page=layout

I need that logo instead of the plain H1 text at the top of the website and login page that just says the domain in lower case

thanks
Marcus