How to set the default style?

Ok I got the default purple looking style that came with the software on the forum already, but now I've recently gotten a new style made for me and I just uploaded it to the forum, it works great...

But now how do I set that as the default style that shows to guests and users not logged in? instead of the default purple one?

After i log in it shows to me because i chose the style in my user cp, but what about everyone else? Can I set a default style for the whole forum like the purple one is to start with?

Thanks in advance for any help :nervous: