Where do I change the Email settings... no emails are sendin

Hi, I've just installed Web Auction, which looks great.
I can't however work out how to configure the email. A user can't register to bid for example because the activation email can't send.
Can you please point me in the right direction?
I can't however work out how to configure the email. A user can't register to bid for example because the activation email can't send.
Can you please point me in the right direction?