wild card ssl cert installation on SSG140

Hi;

I have a SSG 140 appliance, and I install a wild card ssl cert (.cer) file to my SSG 140.  

1. How can I make it as default ssl cert, whenever I enter https://myfirewall.company.com domain, and I see my cert in CA group, not in LOCAL group, based on my research, my cert should be in LOCAL group, only those root cert, or intermediate cert will be loaded to CA group.

2. using this cert as my SSL VPN cert.

I can see my certificate load to appliance but when I enterhttps://myfirewall.company.com, I found that it is using self sign cert only.

Also, I have a site to site vpn, if I make my wild card ssl cert active, would it break my Site to site link>

Please help to solve this issue?