MyBB Community Forums

I need to change the settings for new users when they are registering. There is a line and a box that is not normally checked. It says "Automatically subscribe to threads you post in" . I what that box normally checked. So that the person would have to uncheck the box if they choose to. How do I do it? Here is the link to my site and the page. http://www.autowebrepair.com/forum/uploa...n=register

Thanks
Cary York