Changing the Email Address of the new members message?

Hi

i want to change the email address used on the new members registration page

see screenshot
http://awesomescreenshot.com/09353nefb4

So when a user registers on the site, and submit their details they get an automated email with their activation code i need to change the sending address please

Domain: http://tinyurl.com/lguqz6p
Support Access is open

(please don't post any image/ link / brand name here please)

Thanks

Tom